Railways Exam  >  Railways Questions  >  A boat covers 63 km upstream in 9 hours and c... Start Learning for Free
A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?
  • a)
    8.7
  • b)
    8.5
  • c)
    7
  • d)
    8
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A boat covers 63 km upstream in 9 hours and covers the same distance d...
Upstream speed = Distance/time = 63/9 = 7 km/hr
Downstream speed = Distance/time = 63/7 = 9 km/hr
∵ Speed in still water = 1/2 × (Upstream speed + Downstream speed)
∴ Speed of boat in still water = (9 + 7)/2 = 8 km/hr
View all questions of this test
Most Upvoted Answer
A boat covers 63 km upstream in 9 hours and covers the same distance d...
B Speed of the boat in still water
- Let the speed of the boat in still water be x km/hr.
- Let the speed of the stream be y km/hr.
b Speed of the boat upstream
- Speed of the boat in still water - speed of the stream = x - y km/hr
- Distance covered upstream = 63 km
- Time taken to cover 63 km upstream = 9 hours
- According to the formula: Distance = Speed × Time
- 63 = (x - y) × 9
- x - y = 7
b Speed of the boat downstream
- Speed of the boat in still water + speed of the stream = x + y km/hr
- Distance covered downstream = 63 km
- Time taken to cover 63 km downstream = 7 hours
- 63 = (x + y) × 7
- x + y = 9
b Solving the equations
- From the above two equations:
- x - y = 7
- x + y = 9
- Adding the two equations: 2x = 16
- x = 8 km/hr
b Conclusion
- The speed of the boat in still water is 8 km/hr.
- Therefore, the correct answer is option 'D'.
Explore Courses for Railways exam
A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?a)8.7b)8.5c)7d)8Correct answer is option 'D'. Can you explain this answer?
Question Description
A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?a)8.7b)8.5c)7d)8Correct answer is option 'D'. Can you explain this answer? for Railways 2024 is part of Railways preparation. The Question and answers have been prepared according to the Railways exam syllabus. Information about A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?a)8.7b)8.5c)7d)8Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Railways 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?a)8.7b)8.5c)7d)8Correct answer is option 'D'. Can you explain this answer?.
Solutions for A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?a)8.7b)8.5c)7d)8Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Railways. Download more important topics, notes, lectures and mock test series for Railways Exam by signing up for free.
Here you can find the meaning of A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?a)8.7b)8.5c)7d)8Correct answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?a)8.7b)8.5c)7d)8Correct answer is option 'D'. Can you explain this answer?, a detailed solution for A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?a)8.7b)8.5c)7d)8Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?a)8.7b)8.5c)7d)8Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours. What is the speed (in km/hr) of the boat in still water?a)8.7b)8.5c)7d)8Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice Railways tests.
Explore Courses for Railways exam

Top Courses for Railways

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev