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A man rows 15 km downstream in 3 hours and 9 km upstream in 3 hours. What is the speed of the stream?

1. 1 km/h
2. 2 km/h
3. 3 km/h
4. 4 km/h

Correct answer: 1 km/h

Solution

Downstream speed = 15/3 = 5 km/h and upstream speed = 9/3 = 3 km/h. The speed of the stream is half the difference of these speeds, i.e. (5 - 3)/2 = 1 km/h.

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