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Question

A boat travels a certain distance downstream in 72 minutes but takes 3 hours to cover the same distance upstream. The speed of the stream is 15 km/h. If the boat's speed in still water were reduced by 20%, how much time (in minutes) would it take for the boat to travel 236.5 km downstream?

A 300

B 360

C 270

D 330

E 290

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