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A man can row 4.5 km/hr in still water. It takes him twice as long to row upstream as to row downstream. What is the rate of the current ?
- a)3.5 km/hr
- b)2.5 km/hr.
- c)4.5 km/hr.
- d)1.5 km/hr
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A man can row 4.5 km/hr in still water. It takes him twice as long to ...
Speed of boat in still water (b) = 4.5 km/hr. Speed of boat with stream (Down Stream), D = b + u Speed of boat against stream (Up stream), U = b – u It is given upstream time is twice to that of down stream. ⇒ Downstream speed is twice to that of upstream. So b + u = 2(b – u) ⇒ u =b/3 = 1.5 km/hr.
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Community Answer
A man can row 4.5 km/hr in still water. It takes him twice as long to ...
Given:
- Speed of man in still water = 4.5 km/hr
- Time taken to row upstream = 2 × time taken to row downstream
To find: Rate of the current
Let's assume:
- Speed of current = x km/hr
- Speed of man while rowing upstream = 4.5 - x km/hr
- Speed of man while rowing downstream = 4.5 + x km/hr
- Distance = D km (Assuming the distance covered both upstream and downstream is the same)
Formula used:
- Time = Distance / Speed
Calculation:
- Time taken to row upstream = D / (4.5 - x)
- Time taken to row downstream = D / (4.5 + x)
- According to the question, 2 × (D / (4.5 + x)) = D / (4.5 - x)
- Solving for x, we get x = 1.5 km/hr
Therefore, the rate of the current is 1.5 km/hr.
- Speed of man in still water = 4.5 km/hr
- Time taken to row upstream = 2 × time taken to row downstream
To find: Rate of the current
Let's assume:
- Speed of current = x km/hr
- Speed of man while rowing upstream = 4.5 - x km/hr
- Speed of man while rowing downstream = 4.5 + x km/hr
- Distance = D km (Assuming the distance covered both upstream and downstream is the same)
Formula used:
- Time = Distance / Speed
Calculation:
- Time taken to row upstream = D / (4.5 - x)
- Time taken to row downstream = D / (4.5 + x)
- According to the question, 2 × (D / (4.5 + x)) = D / (4.5 - x)
- Solving for x, we get x = 1.5 km/hr
Therefore, the rate of the current is 1.5 km/hr.
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A man can row 4.5 km/hr in still water. It takes him twice as long to row upstream as to row downstream. What is the rate of the current ?a)3.5 km/hr b)2.5 km/hr. c)4.5 km/hr. d)1.5 km/hrCorrect answer is option 'D'. Can you explain this answer? for Quant 2026 is part of Quant preparation. The Question and answers have been prepared according to the Quant exam syllabus. Information about A man can row 4.5 km/hr in still water. It takes him twice as long to row upstream as to row downstream. What is the rate of the current ?a)3.5 km/hr b)2.5 km/hr. c)4.5 km/hr. d)1.5 km/hrCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Quant 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A man can row 4.5 km/hr in still water. It takes him twice as long to row upstream as to row downstream. What is the rate of the current ?a)3.5 km/hr b)2.5 km/hr. c)4.5 km/hr. d)1.5 km/hrCorrect answer is option 'D'. Can you explain this answer?.
A man can row 4.5 km/hr in still water. It takes him twice as long to row upstream as to row downstream. What is the rate of the current ?a)3.5 km/hr b)2.5 km/hr. c)4.5 km/hr. d)1.5 km/hrCorrect answer is option 'D'. Can you explain this answer? for Quant 2026 is part of Quant preparation. The Question and answers have been prepared according to the Quant exam syllabus. Information about A man can row 4.5 km/hr in still water. It takes him twice as long to row upstream as to row downstream. What is the rate of the current ?a)3.5 km/hr b)2.5 km/hr. c)4.5 km/hr. d)1.5 km/hrCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Quant 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A man can row 4.5 km/hr in still water. It takes him twice as long to row upstream as to row downstream. What is the rate of the current ?a)3.5 km/hr b)2.5 km/hr. c)4.5 km/hr. d)1.5 km/hrCorrect answer is option 'D'. Can you explain this answer?.
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