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The speed of the boat in still water is 18 km/hr and the speed of the current is 2 km/hr. If A man rows his boat upstream for 3 hours and downstream for 2 hours. Find the total distance travelled by him?
  • a)
    94 km
  • b)
    78 km
  • c)
    84 km
  • d)
    88 km
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The speed of the boat in still water is 18 km/hr and the speed of the ...
Let speed of boat in still water is SB and speed of current is Sand Speed of boat in upstream and downstream is SU and SD.
Speed of boat in still water S= 18 km/hr
Speed of current, S= 2 km/hr
Speed of boat in upstream, S= 18 - 2 = 16 km/hr
Speed of boat in downstream, S= 18 + 2 = 20 km/hr
∴ Total distance travelled = 3 × 16 + 2 × 20 = 48 + 40 = 88 km
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Most Upvoted Answer
The speed of the boat in still water is 18 km/hr and the speed of the ...
Given:
Speed of the boat in still water = 18 km/hr
Speed of the current = 2 km/hr
Time taken to row upstream = 3 hours
Time taken to row downstream = 2 hours

To find:
Total distance travelled by the man

Solution:
Let's assume the distance to be covered as 'd' km.

Speed of the boat upstream:
When the boat is rowed upstream, it moves against the current. Therefore, the effective speed of the boat is the difference between the speed of the boat in still water and the speed of the current.
Speed upstream = Speed in still water - Speed of the current
= 18 km/hr - 2 km/hr
= 16 km/hr

Distance travelled upstream:
Distance = Speed × Time
Distance upstream = Speed upstream × Time taken to row upstream
= 16 km/hr × 3 hours
= 48 km

Speed of the boat downstream:
When the boat is rowed downstream, it moves with the current. Therefore, the effective speed of the boat is the sum of the speed of the boat in still water and the speed of the current.
Speed downstream = Speed in still water + Speed of the current
= 18 km/hr + 2 km/hr
= 20 km/hr

Distance travelled downstream:
Distance downstream = Speed downstream × Time taken to row downstream
= 20 km/hr × 2 hours
= 40 km

Total distance travelled:
Total distance travelled = Distance upstream + Distance downstream
= 48 km + 40 km
= 88 km

Hence, the total distance travelled by the man is 88 km, which corresponds to option (D).
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The speed of the boat in still water is 18 km/hr and the speed of the current is 2 km/hr. If A man rows his boat upstream for 3 hours and downstream for 2 hours. Find the total distance travelled by him?a)94 kmb)78 kmc)84 kmd)88 kmCorrect answer is option 'D'. Can you explain this answer?
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The speed of the boat in still water is 18 km/hr and the speed of the current is 2 km/hr. If A man rows his boat upstream for 3 hours and downstream for 2 hours. Find the total distance travelled by him?a)94 kmb)78 kmc)84 kmd)88 kmCorrect 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 The speed of the boat in still water is 18 km/hr and the speed of the current is 2 km/hr. If A man rows his boat upstream for 3 hours and downstream for 2 hours. Find the total distance travelled by him?a)94 kmb)78 kmc)84 kmd)88 kmCorrect 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 The speed of the boat in still water is 18 km/hr and the speed of the current is 2 km/hr. If A man rows his boat upstream for 3 hours and downstream for 2 hours. Find the total distance travelled by him?a)94 kmb)78 kmc)84 kmd)88 kmCorrect answer is option 'D'. Can you explain this answer?.
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