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17 July, 17:39

A boat travels 30 miles upstream in 5 hours. The return trip downstream takes 3 hours. If the boat travels at the same rate on both parts of the trip, what is the rate of the current, in miles per hour?

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  1. 17 July, 18:07
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    5/30-x = 10/30+x

    5 (30+x) = 10 (30-x)

    150+5x = 300-10x

    5x+10x=300-150

    15x = 150

    x = 10 mph
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