Question 54

Rahul can row a certain distance downstream in 6 hours and return the same distance in 9 hours. If the speed of Rahul in still water is 12 km/hr, find the speed of the stream.

Solution

Let the speed of Rahul be u and that of stream be v and the distance travelled be d.

d/u+v = 6 and d/u-v = 9

Given u = 12 km/hr

6u + 6v = d and d = 9u - 9v

So, 6u + 6v = 9u - 9v

3u = 15v, so u = 5v

v = 12/5 = 2.4 km/hr

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