A man can row at 6 km/h in still water. It takes 3 hours more to cover the same distance upstream than downstream. If the speed of the current is 2 km/h, then find the distance.

20 km
30 km
38 km
24 km

Correct answer: 24 km

Solution

Upstream speed = 6 - 2 = 4 km/h and downstream speed = 6 + 2 = 8 km/h. If the distance is d, then d/4 - d/8 = 3. Solving gives d/8 = 3, so d = 24 km.

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