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Speed of boat in still water is 11.5 km/h. Speed of stream is 1.5 km/h. If it takes 4 hours to go downstream and return, what is the total distance traveled?

1. 520 km
2. 92 km
3. 184 km
4. 260 km

Correct answer: 520 km

Solution

Downstream = 13 km/hr, Upstream = 10 km/hr. Round trip: d/13 + d/10 = 4 → d(1/13+1/10) = 4 → d×23/130 = 4 → d = 520/23 ≈ 22.6 km. Total = 2d ≈ 45.2 km. The provided answer '520 km' is incorrect (likely computed as 13×10×4 = 520, wrong formula). None of the four options match the correct answer. Question is defective.

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