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A boat traveled upstream a distance of 90 miles at an [#permalink]
23 Sep 2006, 22:01

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A boat traveled upstream a distance of 90 miles at an average speed of (V-3) miles per hour and then traveled the same distance downstream at an average speed of (v+3) miles per hour. If the trip upstream took half hour longer than the trip downstream, how many hours did it take the boat to travel downstream?