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A boat goes 6 km against the current of the stream in 2 hours and goes 8 km along the current in half hour.

A boat goes 6 km against the current of the stream in 2 hours and goes 8 km along the current in half hour. How long will it take to go 28.5 km in stationary water? A) 4 1/2 hours B) 3 hours C) 3 1/2 hours D) 4 hours E) None of these

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