Boats & Streams · Question 24 · Medium
Boats & Streams question 24
Ishaan rows to a ghat 30 km away and back in 8 hours. He finds he can row 5 km downstream in the same time as 3 km upstream. What is the speed of the stream?
- 1 km/h
- 4 km/h
- 3 km/h
- 2 km/h
Answer and explanation
Answer: D. 2 km/h
Explanation: Downstream and upstream speeds are in the ratio 5 : 3, say 5k and 3k. Then 30/(5k) + 30/(3k) = 8, i.e. 16/k = 8, so k = 2: downstream 10 km/h, upstream 6 km/h. Stream = (10 − 6)/2 = 2 km/h.
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