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The speed of the stream is 10 km/h. Boat ‘A’ covers 150 km distance against the stream in 6 hours and boat ‘B’ covers 108 km distance against the stream in 6 hours. The speed of boat ‘B’ in still water is how much percent of the speed of boat ‘A’ in still water?

A 70%

B 30%

C 60%

D 80%

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