Question

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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