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Q.

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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a

336 s

b

340 s

c

250 s

d

420 s

answer is D.

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Detailed Solution

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

T = 3361 = 336sec

 

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