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The ratio of the speed of boats ‘A’ and ‘B’ in still water is 8:9, respectively. The speed of the current is 25% of the speed of boat ‘A’ in still water. If boat ‘A’ takes 9 hours to travel 810 km downstream, then find the time taken by boat ‘B’ to travel 252 km upstream and 792 km downstream. (Note: Both the boats are rowing in the same stream.)

A 12 hours

B 10 hours

C 11 hours

D 9 hours

E None of these

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