Discussion of Question with ID = 034 under Boats-and-Streams

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The speed of a boat in still water is 28 km/h. It takes the same time to travel an upstream distance of 2 km as it takes to travel a downstream distance of 12 km. The rate of flow of the stream is?


20 km/h.


21 km/h.


19 km/h.


23 km/h.

Ans: a

Let v km/h be the rate of flow of the stream. Upstream and downstream times are equal. So $2/{28 - v}$ = $12/{28 + v}$. Solving for v, or verifying by putting the given options one by one, we get v = 20 km/h.

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