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Question

The speed of the boat in still water is 10 km/hr and the

speed of the stream is 5 km/hr. A boat goes 75 km downstream with its usual speed but at the time of returning the speed of the boat in still water is doubled. Find the total time taken by boat to cover the whole distance.

A 6.6 hours

B 12 hours

C 10 hours

D 9.6 hours

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