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Boat ‘A’ can cover 120 km in still water in 12 hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 5:4 and the speed of stream is 3 km/hr then find the time taken by boat ‘B’ to cover the 264 km in downstream.

A 20 hours

B 22 hours

C 24 hours

D 21 hours

E None of these

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