A man can row upstream 32 km in 4 hours. If the speed of current is 2 km/hr, find how much he can go downstream in 6 hours?

70 km
72 km
64 km
81 km

Correct Answer: 72 km

Explanation:

∵ Upstream rate = 32/4 = 8 km/hr
⇒ Speed of man in still water = 8 + 2 = 10 km/hr
⇒ Downstream rate = (10 + 2) = 12 km/hr
Now, the required distance = 12 x 6 = 72 km

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