A man can row 9 km/h in still water. It takes him twice as long to row upstream as to row downstream. Find the speed of the stream.

Topic: Speed, Time &amp; Distance
Subtopic: Boats and Streams

A2 km/h

B3 km/h

C4.5 km/h

D5 km/h

Explanation

Let stream speed be v. Downstream speed = 9 + v, Upstream speed = 9 – v. Time ratio: (9 + v) = 2(9 – v) => 9 + v = 18 – 2v => 3v = 9 => v = 3 km/h.

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