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Boat ‘A’ can cover 120 km in still water in 10 hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 4:5 and the speed of stream is 2 km/hr then find the time taken by boat ‘B’ to cover the 170 km in downstream.

A 10 hours

B 9 hours

C 8 hours

D 12 hours

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