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Q.

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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a

2 hours 20 minutes 

b

2 hours 40 minutes 

c

3 hours 30 minutes

answer is B.

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Detailed Solution

Velocity of boat Question Image 

Velocity of water Question Image 

Up stream Question Image 

Question Image 

Question Image 

Down streamQuestion Image 

Question Image 

Question Image 

Total time T = 2hours 40 minutes 

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