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A boat takes two hours to travel 8 km and come back in still water lake. If the velocity of water is 4 kmph the time taken for going upstream of 8 km and coming back is

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2 hours 20 minutes

2 hours 40 minutes

3 hours 30 minutes

answer is B.

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Velocity of boat Question Image

Velocity of water Question Image

Up stream Question Image

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Down stream Question Image

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Total time T = 2hours 40 minutes

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