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30-06-2017
Mathematics

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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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30-06-2017

(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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