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Boat ‘A’ can cover 180 km in still water in 12 hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 3:4 and the speed of stream is 3 km/hr then find the time taken by boat ‘B’ to cover the 253 km in downstream.

A 10 hours

B 12 hours

C 11 hours

D 13 hours

E None of these

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