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A boat moves in a river where the ratio of the speed of the stream to the downstream speed of the boat is 1:6. If it takes the boat a total of 20 hours to travel 144 km downstream and return 144 km upstream, how much time will it take to cover 180 km in still water?

A 22 hrs

B 10 hrs

C 12 hrs

D 24 hrs

E None of these

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IBPS RRB PO

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