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All questions of Boats and Streams for SSC CGL Exam
If 60% of the downstream speed of a boat is the same as the upstream speed of the boat. The speed of stream is what percentage of the speed of the boat in still water?- a)20
- b)25
- c)30
- d)40
Correct answer is option 'B'. Can you explain this answer?
If 60% of the downstream speed of a boat is the same as the upstream speed of the boat. The speed of stream is what percentage of the speed of the boat in still water?
a)
20
b)
25
c)
30
d)
40
 | Iq Funda answered |
60% of downstream speed = Upstream speed
Downstream speed : Upstream speed = 100 : 60 = 5 : 3
Stream speed : Speed of the boat in still water
Hence, Option B is correct.
Downstream speed : Upstream speed = 100 : 60 = 5 : 3
Stream speed : Speed of the boat in still water
Hence, Option B is correct.
A man swims 1 km upstream in 1/4 hour. If the speed of the current is 1 km/ hour, in how many seconds can it swim 400 meters upstream?- a)300
- b)360
- c)400
- d)420
Correct answer is option 'B'. Can you explain this answer?
A man swims 1 km upstream in 1/4 hour. If the speed of the current is 1 km/ hour, in how many seconds can it swim 400 meters upstream?
a)
300
b)
360
c)
400
d)
420
 | Bayshore Academy answered |
So the answer = 0.10 × 3600 = 360 seconds
Hence, Option B is correct.
A man goes 80 km downstream and returns to the starting point in a total of 6 hours. If the ratio of the upstream speed to the downstream speed is 1 : 5, what is the speed of the stream?- a)24 km/hr
- b)30 km/hr
- c)32 km/hr
- d)36 km/hr
Correct answer is option 'C'. Can you explain this answer?
A man goes 80 km downstream and returns to the starting point in a total of 6 hours. If the ratio of the upstream speed to the downstream speed is 1 : 5, what is the speed of the stream?
a)
24 km/hr
b)
30 km/hr
c)
32 km/hr
d)
36 km/hr
 | Target Study Academy answered |
Let the upstream speed = x km/hr
Downstream speed = 5x km/hr
96 = 6x
x = 16
Hence, Option C is correct.
Downstream speed = 5x km/hr
96 = 6x
x = 16
Hence, Option C is correct.
A boat travels 80 km downstream in 4 hours. If the speed of the stream is 5 km/hr, in how many hours can it travel 40 km upstream?- a)1
- b)2
- c)3
- d)4
Correct answer is option 'D'. Can you explain this answer?
A boat travels 80 km downstream in 4 hours. If the speed of the stream is 5 km/hr, in how many hours can it travel 40 km upstream?
a)
1
b)
2
c)
3
d)
4
 | EduRev SSC CGL answered |
Upstream speed = 20 – 5 × 2 = 10 km/hr
Hence, Option D is correct.
A man swims 5 km downstream in 1 hour. If the speed of the current is 1 km/hr, in how many minutes can he swim 200 meters upstream?- a)1
- b)2
- c)3
- d)4
Correct answer is option 'D'. Can you explain this answer?
A man swims 5 km downstream in 1 hour. If the speed of the current is 1 km/hr, in how many minutes can he swim 200 meters upstream?
a)
1
b)
2
c)
3
d)
4
 | Ssc Cgl answered |
US = 5 – 2 = 3 km/hr
Hence, Option D is correct.
The time taken by a boat while covering a certain distance upstream is thrice the time taken by it while covering the same distance in still water. If the upstream speed is 6 km/hr, what is the downstream speed?- a)10 km/hr
- b)15 km/hr
- c)16 km/hr
- d)30 km/hr
Correct answer is option 'D'. Can you explain this answer?
The time taken by a boat while covering a certain distance upstream is thrice the time taken by it while covering the same distance in still water. If the upstream speed is 6 km/hr, what is the downstream speed?
a)
10 km/hr
b)
15 km/hr
c)
16 km/hr
d)
30 km/hr
 | Ishaan Roy answered |
Given Information:
- Upstream speed = 6 km/hr
- Time taken upstream = 3 times the time taken in still water
Let's assume:
- Speed of the boat in still water = x km/hr
- Time taken in still water = t hours
Calculating Time taken upstream and downstream:
- Time taken upstream = Distance/ (x-6) (since speed upstream = x - 6)
- Time taken downstream = Distance/ (x+6) (since speed downstream = x + 6)
Given that time taken upstream = 3 times time taken in still water:
Distance/ (x-6) = 3t
Distance/ (x-6) = 3t
Distance/ (x-6) = t
3t = t
3 = 1
This is not possible as the times cannot be equal. Hence, the assumption that time taken in still water is t hours is incorrect.
Re-assuming:
Let's assume the time taken in still water = 1 hour.
Given that time taken upstream is 3 times time taken in still water:
Time taken upstream = 3 hours
Now, substituting the values:
Distance/ (x-6) = 3
Distance = 3(x-6)
Given that time taken downstream is 1 hour (time taken in still water):
Distance/ (x+6) = 1
Distance = x+6
Equating the two expressions for Distance:
3(x-6) = x+6
3x - 18 = x + 6
2x = 24
x = 12
Therefore, the downstream speed is x + 6 = 12 + 6 = 18 km/hr
Hence, the correct answer is 30 km/hr (Option D).
- Upstream speed = 6 km/hr
- Time taken upstream = 3 times the time taken in still water
Let's assume:
- Speed of the boat in still water = x km/hr
- Time taken in still water = t hours
Calculating Time taken upstream and downstream:
- Time taken upstream = Distance/ (x-6) (since speed upstream = x - 6)
- Time taken downstream = Distance/ (x+6) (since speed downstream = x + 6)
Given that time taken upstream = 3 times time taken in still water:
Distance/ (x-6) = 3t
Distance/ (x-6) = 3t
Distance/ (x-6) = t
3t = t
3 = 1
This is not possible as the times cannot be equal. Hence, the assumption that time taken in still water is t hours is incorrect.
Re-assuming:
Let's assume the time taken in still water = 1 hour.
Given that time taken upstream is 3 times time taken in still water:
Time taken upstream = 3 hours
Now, substituting the values:
Distance/ (x-6) = 3
Distance = 3(x-6)
Given that time taken downstream is 1 hour (time taken in still water):
Distance/ (x+6) = 1
Distance = x+6
Equating the two expressions for Distance:
3(x-6) = x+6
3x - 18 = x + 6
2x = 24
x = 12
Therefore, the downstream speed is x + 6 = 12 + 6 = 18 km/hr
Hence, the correct answer is 30 km/hr (Option D).
A boat goes 2 km along the stream in 6 minutes and 20 km against the stream in 4 hours. What is the speed of the boat in still water?- a)8 km/hr
- b)10 km/hr
- c)12.50 km/hr
- d)15 km/hr
Correct answer is option 'C'. Can you explain this answer?
A boat goes 2 km along the stream in 6 minutes and 20 km against the stream in 4 hours. What is the speed of the boat in still water?
a)
8 km/hr
b)
10 km/hr
c)
12.50 km/hr
d)
15 km/hr
| | Ssc Cgl answered |
Speed of the boat in still water
Hence, Option C is correct.
If the speed of a stream is 5 km/hr and the speed of a boat in still water is 15 km/hr, what is the downstream speed of the boat?- a)20 km/hr
- b)25 km/hr
- c)30 km/hr
- d)40 km/hr
Correct answer is option 'A'. Can you explain this answer?
If the speed of a stream is 5 km/hr and the speed of a boat in still water is 15 km/hr, what is the downstream speed of the boat?
a)
20 km/hr
b)
25 km/hr
c)
30 km/hr
d)
40 km/hr
 | Arnav Saini answered |
Understanding the Problem:
Given:
Speed of the stream = 5 km/hr
Speed of the boat in still water = 15 km/hr
Downstream Speed Formula:
The downstream speed of the boat is the sum of the speed of the boat in still water and the speed of the stream.
Calculating Downstream Speed:
Downstream speed = Speed of boat in still water + Speed of stream
Downstream speed = 15 km/hr + 5 km/hr
Downstream speed = 20 km/hr
Therefore, the downstream speed of the boat is 20 km/hr. Hence, option 'A' (20 km/hr) is the correct answer.
Given:
Speed of the stream = 5 km/hr
Speed of the boat in still water = 15 km/hr
Downstream Speed Formula:
The downstream speed of the boat is the sum of the speed of the boat in still water and the speed of the stream.
Calculating Downstream Speed:
Downstream speed = Speed of boat in still water + Speed of stream
Downstream speed = 15 km/hr + 5 km/hr
Downstream speed = 20 km/hr
Therefore, the downstream speed of the boat is 20 km/hr. Hence, option 'A' (20 km/hr) is the correct answer.
The still water speed of a boat is 30 km/hr. It goes 28 km upstream in 1 hour 45 minutes. What is the downstream speed of the boat?- a)20 km/hr
- b)27 km/hr
- c)32 km/hr
- d)44 km/hr
Correct answer is option 'D'. Can you explain this answer?
The still water speed of a boat is 30 km/hr. It goes 28 km upstream in 1 hour 45 minutes. What is the downstream speed of the boat?
a)
20 km/hr
b)
27 km/hr
c)
32 km/hr
d)
44 km/hr
 | Malavika Rane answered |
Understanding the Problem
To find the downstream speed of the boat, we first need to determine the effective speed of the boat while going upstream, and then use that to find the downstream speed.
Given Information
- Still water speed of the boat = 30 km/hr
- Distance traveled upstream = 28 km
- Time taken to travel upstream = 1 hour 45 minutes
Convert Time to Hours
- 1 hour 45 minutes = 1 + 45/60 = 1.75 hours
Calculate Upstream Speed
- Speed = Distance/Time
- Upstream Speed = 28 km / 1.75 hours = 16 km/hr
Calculate Effective Upstream Speed
The effective upstream speed (speed against the current) is the still water speed minus the speed of the current (x):
- Effective Upstream Speed = Still Water Speed - Current Speed
- 16 km/hr = 30 km/hr - x
Find Current Speed
- Rearranging gives us: x = 30 km/hr - 16 km/hr = 14 km/hr
Calculate Downstream Speed
The downstream speed (speed with the current) is the still water speed plus the speed of the current:
- Downstream Speed = Still Water Speed + Current Speed
- Downstream Speed = 30 km/hr + 14 km/hr = 44 km/hr
Conclusion
The downstream speed of the boat is 44 km/hr. Thus, the correct answer is option 'D'.
To find the downstream speed of the boat, we first need to determine the effective speed of the boat while going upstream, and then use that to find the downstream speed.
Given Information
- Still water speed of the boat = 30 km/hr
- Distance traveled upstream = 28 km
- Time taken to travel upstream = 1 hour 45 minutes
Convert Time to Hours
- 1 hour 45 minutes = 1 + 45/60 = 1.75 hours
Calculate Upstream Speed
- Speed = Distance/Time
- Upstream Speed = 28 km / 1.75 hours = 16 km/hr
Calculate Effective Upstream Speed
The effective upstream speed (speed against the current) is the still water speed minus the speed of the current (x):
- Effective Upstream Speed = Still Water Speed - Current Speed
- 16 km/hr = 30 km/hr - x
Find Current Speed
- Rearranging gives us: x = 30 km/hr - 16 km/hr = 14 km/hr
Calculate Downstream Speed
The downstream speed (speed with the current) is the still water speed plus the speed of the current:
- Downstream Speed = Still Water Speed + Current Speed
- Downstream Speed = 30 km/hr + 14 km/hr = 44 km/hr
Conclusion
The downstream speed of the boat is 44 km/hr. Thus, the correct answer is option 'D'.
A boat can cover 60 km downstream in 2 hours when its engine is working and 10 km in 2 hours with the flow (when the engine is off). What is the upstream speed of the boat?- a)8 km/hr
- b)10 km/hr
- c)12 km/hr
- d)None of these
Correct answer is option 'D'. Can you explain this answer?
A boat can cover 60 km downstream in 2 hours when its engine is working and 10 km in 2 hours with the flow (when the engine is off). What is the upstream speed of the boat?
a)
8 km/hr
b)
10 km/hr
c)
12 km/hr
d)
None of these
 | Glance Learning Institute answered |
Reqd. speed = 30 – 5 × 2 = 20 km/hr
Hence, Option D is correct.
If the downstream speed of a boat is 15 km/hr and the speed of the stream is 2 km/hr, what is the speed of the boat in still water?- a)17 km/hr
- b)12 km/hr
- c)14 km/hr
- d)13 km/hr
Correct answer is option 'D'. Can you explain this answer?
If the downstream speed of a boat is 15 km/hr and the speed of the stream is 2 km/hr, what is the speed of the boat in still water?
a)
17 km/hr
b)
12 km/hr
c)
14 km/hr
d)
13 km/hr
| | Bayshore Academy answered |
Speed of the boat in still water = 15 – 2 = 13 km/hr
Hence, Option D is correct.
Hence, Option D is correct.
If the speed of a boat in still water is 15 km/hr and the speed of the stream is 3 km/hr, how much downstream distance can it cover in 3 hours?- a)32 km
- b)40 km
- c)46 km
- d)54 km
Correct answer is option 'D'. Can you explain this answer?
If the speed of a boat in still water is 15 km/hr and the speed of the stream is 3 km/hr, how much downstream distance can it cover in 3 hours?
a)
32 km
b)
40 km
c)
46 km
d)
54 km
| | EduRev SSC CGL answered |
Downstream speed = 15 + 3 = 18 km/hr
So the answer = 18 × 3 = 54 km
Hence, Option D is correct.
So the answer = 18 × 3 = 54 km
Hence, Option D is correct.
A sailor goes 24 km downstream in 48 minutes and returns in 1 hour 20 minutes. What is the ratio of the upstream speed to the downstream speed?- a)1 : 2
- b)2 : 3
- c)3 : 4
- d)3 : 5
Correct answer is option 'D'. Can you explain this answer?
A sailor goes 24 km downstream in 48 minutes and returns in 1 hour 20 minutes. What is the ratio of the upstream speed to the downstream speed?
a)
1 : 2
b)
2 : 3
c)
3 : 4
d)
3 : 5
| | Ssc Cgl answered |
1 hour 20 minutes = 80 minutes
Upstream time : Downstream time = 80 : 48 = 5 : 3
Upstrem speed : Downstream speed = 3 : 5
Hence, Option D is correct.
Upstream time : Downstream time = 80 : 48 = 5 : 3
Upstrem speed : Downstream speed = 3 : 5
Hence, Option D is correct.
If the speed of a boat in still water is 12 km/hr and the speed of the stream is 3 km/hr, in how many hours can it cover 75 km downstream?- a)1
- b)2
- c)2.50
- d)5
Correct answer is option 'D'. Can you explain this answer?
If the speed of a boat in still water is 12 km/hr and the speed of the stream is 3 km/hr, in how many hours can it cover 75 km downstream?
a)
1
b)
2
c)
2.50
d)
5
| | Ssc Cgl answered |
Downstream speed = 12 + 3 = 15 km/hr
Hence, Option D is correct.
Hence, Option D is correct.
Boat A beats Boat B by 100 meters in a 1000 meters downstream race. What is the ratio of the downstream speed of Boat A to that of Boat B?- a)1 : 2
- b)2 : 1
- c)5 : 4
- d)10 : 9
Correct answer is option 'D'. Can you explain this answer?
Boat A beats Boat B by 100 meters in a 1000 meters downstream race. What is the ratio of the downstream speed of Boat A to that of Boat B?
a)
1 : 2
b)
2 : 1
c)
5 : 4
d)
10 : 9
 | T.S Academy answered |
Speed → A : B = 1000 : (1000 – 100) = 10 : 9
Hence, Option D is correct.
Hence, Option D is correct.
If the downstream speed of a boat is 19 km/hr and the speed of the stream is 4 km/hr, what is the upstream speed of the boat?- a)8 km/hr
- b)15 km/hr
- c)11 km/hr
- d)23 km/hr
Correct answer is option 'C'. Can you explain this answer?
If the downstream speed of a boat is 19 km/hr and the speed of the stream is 4 km/hr, what is the upstream speed of the boat?
a)
8 km/hr
b)
15 km/hr
c)
11 km/hr
d)
23 km/hr
| | Ssc Cgl answered |
Upstream speed of the boat = 19 – 4 × 2 = 11 km/hr
Hence, Option C is correct.
Hence, Option C is correct.
If the speed of a stream is 3 km/hr and the speed of a boat in still water is 14 km/hr, what is the upstream speed of the boat?- a)7 km/hr
- b)9 km/hr
- c)10 km/hr
- d)11 km/hr
Correct answer is option 'D'. Can you explain this answer?
If the speed of a stream is 3 km/hr and the speed of a boat in still water is 14 km/hr, what is the upstream speed of the boat?
a)
7 km/hr
b)
9 km/hr
c)
10 km/hr
d)
11 km/hr
| | T.S Academy answered |
Upstream speed of the boat = 14 – 3 = 11 km/hr
Hence, Option D is correct.
Hence, Option D is correct.
If the upstream speed and downstream speed of a boat are 9 km/hr and 36 km/hr, respectively, what is the speed of the boat in still water?- a)20 km/hr
- b)22.50 km/hr
- c)25 km/hr
- d)30 km/hr
Correct answer is option 'B'. Can you explain this answer?
If the upstream speed and downstream speed of a boat are 9 km/hr and 36 km/hr, respectively, what is the speed of the boat in still water?
a)
20 km/hr
b)
22.50 km/hr
c)
25 km/hr
d)
30 km/hr
| | Iq Funda answered |
Speed of the boat in still water
Hence, Option B is correct.
Hence, Option B is correct.
If a boat can cover 800 meters upstream in 200 seconds, in how many minutes can it cover 84 km downstream?- a)20
- b)25
- c)30
- d)Can't be determined
Correct answer is option 'D'. Can you explain this answer?
If a boat can cover 800 meters upstream in 200 seconds, in how many minutes can it cover 84 km downstream?
a)
20
b)
25
c)
30
d)
Can't be determined
| | EduRev SSC CGL answered |
Since neither the downstream speed nor the speed of the stream is given, the answer cannot be determined.
Hence, Option D is correct.
Hence, Option D is correct.
A man rows a boat 48 km downstream in 3 hours and returns the same distance upstream in 6 hours. What is the ratio of the upstream speed to the downstream speed?- a)1 : 2
- b)1 : 3
- c)1 : 5
- d)1 : 7
Correct answer is option 'A'. Can you explain this answer?
A man rows a boat 48 km downstream in 3 hours and returns the same distance upstream in 6 hours. What is the ratio of the upstream speed to the downstream speed?
a)
1 : 2
b)
1 : 3
c)
1 : 5
d)
1 : 7
| | Iq Funda answered |
So the answer = 8 : 16 = 1 : 2
Hence, Option A is correct.
The speed of a boat in still water is 15 km/hr. It covers 45 km upstream in 6 hours. What is the speed of the stream?- a)7.50 km/hr
- b)8 km/hr
- c)9 km/hr
- d)10 km/hr
Correct answer is option 'A'. Can you explain this answer?
The speed of a boat in still water is 15 km/hr. It covers 45 km upstream in 6 hours. What is the speed of the stream?
a)
7.50 km/hr
b)
8 km/hr
c)
9 km/hr
d)
10 km/hr
| | EduRev SSC CGL answered |
Upstream speed of the boat
Speed of the stream = 15 – 7.50 = 7.50 km/hr
Hence, Option A is correct.
Speed of the stream = 15 – 7.50 = 7.50 km/hr
Hence, Option A is correct.
If the upstream speed of a boat is 12 km/hr and the speed of the stream is 12 km/hr, what is the downstream speed of the boat?- a)0 km/hr
- b)12 km/hr
- c)36 km/hr
- d)24 km/hr
Correct answer is option 'C'. Can you explain this answer?
If the upstream speed of a boat is 12 km/hr and the speed of the stream is 12 km/hr, what is the downstream speed of the boat?
a)
0 km/hr
b)
12 km/hr
c)
36 km/hr
d)
24 km/hr
| | Ssc Cgl answered |
Downstream speed of the boat = 12 + 12 × 2 = 36 km/hr
Hence, Option C is correct.
Hence, Option C is correct.
If the upstream speed of a boat is 17 km/hr and the speed of the stream is 4 km/hr, what is the speed of the boat in still water?- a)13 km/hr
- b)18 km/hr
- c)21 km/hr
- d)24 km/hr
Correct answer is option 'C'. Can you explain this answer?
If the upstream speed of a boat is 17 km/hr and the speed of the stream is 4 km/hr, what is the speed of the boat in still water?
a)
13 km/hr
b)
18 km/hr
c)
21 km/hr
d)
24 km/hr
| | T.S Academy answered |
Speed of the boat in still water = 17 + 4 = 21 km/hr
Hence, Option C is correct.
Hence, Option C is correct.
A boat goes 12 km downstream and comes back to the starting point in 4 hours. If the speed of the stream is half the speed of the boat in still water, what is the speed of the stream?- a)2 km/hr
- b)4 km/hr
- c)6 km/hr
- d)8 km/hr
Correct answer is option 'B'. Can you explain this answer?
A boat goes 12 km downstream and comes back to the starting point in 4 hours. If the speed of the stream is half the speed of the boat in still water, what is the speed of the stream?
a)
2 km/hr
b)
4 km/hr
c)
6 km/hr
d)
8 km/hr
| | Iq Funda answered |
Let the speed of stream = x km/hr
Speed of the boat in still water = 2x km/hr
16 = 4x
So the answer = 4 km/hr
Hence, Option B is correct.
Speed of the boat in still water = 2x km/hr
16 = 4x
So the answer = 4 km/hr
Hence, Option B is correct.
If the upstream speed and downstream speed of a boat are 15 km/hr and 25 km/hr, what is the speed of stream?- a)5 km/hr
- b)6 km/hr
- c)7.50 km/hr
- d)9 km/hr
Correct answer is option 'A'. Can you explain this answer?
If the upstream speed and downstream speed of a boat are 15 km/hr and 25 km/hr, what is the speed of stream?
a)
5 km/hr
b)
6 km/hr
c)
7.50 km/hr
d)
9 km/hr
| | EduRev SSC CGL answered |
Speed of the stream
Hence, Option A is correct.
Hence, Option A is correct.
A man can row 40 km downstream and return in a total of 7 hours. If the ratio of the upstream speed to the downstream speed is 2 : 5, what is the downstream speed?- a)20 km/hr
- b)30 km/hr
- c)25 km/hr
- d)40 km/hr
Correct answer is option 'A'. Can you explain this answer?
A man can row 40 km downstream and return in a total of 7 hours. If the ratio of the upstream speed to the downstream speed is 2 : 5, what is the downstream speed?
a)
20 km/hr
b)
30 km/hr
c)
25 km/hr
d)
40 km/hr
| | EduRev SSC CGL answered |
Let the upstream speed = 2x km/hr
Downstream speed = 5x km/hr
28 = 7x
x = 4
So the answer = 5 × 4 = 20 km/hr
Hence, Option A is correct.
Downstream speed = 5x km/hr
28 = 7x
x = 4
So the answer = 5 × 4 = 20 km/hr
Hence, Option A is correct.
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