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6 August, 12:06

A motorboat heads upstream on a river that has a current of 3 miles per hour. the trip upstream takes 5 hours, and the return trip takes 2.5 hours. what is the speed of the motorboat? (assume that the motorboat maintains a constant speed relative to the water.)

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  1. 6 August, 13:26
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    (V-v) * T = (V+v) * t

    (V-3) * 5 = (V+3) * 2,5

    5V-15=2,5V+7,5

    2,5V=22,5

    V=9 (mph)
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