Railway Recruitment Board Mathematics — Question 651
Question
A man can row 15 km downstream in 3 hours and 9 km upstream in 3 hours. Find speed of stream.
- 1 km/h
- 2 km/h
- 3 km/h
- 4 km/h
Correct answer
A — 1 km/h
Explanation (English)
Downstream speed = 15/3 = 5 km/h. Upstream speed = 9/3 = 3 km/h. Stream speed = (5-3)/2 = 1 km/h
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