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A boat takes 7 hours to cover 231 km upstream and 9 hours to cover 387 km downstream. Find the time taken by the boat to cover 546 km upstream and 495 km downstream if speed of boat in still water is increased by 4 km/h and speed of stream is decreased by 2 km/h.

A 24 hours

B 26 hours

C 22 hours

D 25 hours

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