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A boy can swim in still water at 1 m/s. He swims across a river flowing at 0.6 m/s which is 336 m wide. If he travels in shortest possible time, then what time he takes to cross the river?

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336 s

340 s

250 s

420 s

answer is D.

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Detailed Solution

Time to cross river T=d/v_B for the shortest path.

$T = \frac{336}{1} = 336 \sec$

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