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A boat has a speed of 30 m/s in still water. When moving upstream, its speed is reduced by 16(2/3) % compared to its still water speed. If the speed of the stream increases by 60% and the boat's speed in still water increases by 40%, determine the total time required for the boat to travel 680 meters downstream and then return 680 meters upstream.

A 54 sec

B 66 sec

C 72 sec

D 33.6 sec

E None of these

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