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A man 8 km/hr in still water. If the river is running at 2 km/hr, it taken 32 minutes to row to a place and back. How for is the place?

1.5 km
2.5 km
2 km
3 km

Correct Answer: 2 km

Explanation:

∵ D/(8 - 2) + D/(8 + 2) = 32/60
⇒ D/6 + D/10 = 32/60
⇒ 10D + 6D = 32
∴ D = 2 km

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