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7 July, 06:49

A boat traveled 225 miles each way downstream and back. The trip downstream took 9 hours. The trip back took 15 hours. What is the speed of the boat in still water? What is the speed of the current?

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  1. 7 July, 07:15
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    Boat = 20 mph

    Current = 5 mph

    Step-by-step explanation:

    If b is the speed of the boat, and c is the speed of the current, then:

    b + c = 225 / 9 = 25

    b - c = 225 / 15 = 15

    Solve the system of equations with elimination.

    2b = 40

    b = 20

    Plug back into either equation to find the speed of the current.

    c = 5
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