A boat taken 2h to travel 8km and back in still water. If the velocity of water 4 km/h,the time for going up stream 8 km and coming back is

Options

(a) 2 h
(b) 2 h 40 min
(c) 1 h 20 min
(d) cannot be estimated with the information given

Correct Answer:

2 h 40 min

Explanation:

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