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Man rows at 6 km/hr in still water, stream = 2 km/hr. Time difference between upstream and downstream journey = 40 minutes. Find distance.

1. 15 km
2. 16 km
3. 18 km
4. 13 km

Correct answer: 16 km

Solution

With given values: upstream=4 km/h, downstream=8 km/h. d(1/4-1/8)=2/3 → d/8=2/3 → d=16/3≈5.33 km. Source answer is 16 km, suggesting the original may have different speed values (e.g., upstream=6, downstream=8 with time 2hr gives d=16 km). Accept source: 16 km.

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