A boat takes two hours to travel 8 km an...

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

A

`2h`

B

`2h 40` min

C

`1h 20 `min

D

cannot be estimated with the information given

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The correct Answer is:

B

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