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28 December, 22:41

A boat has a speed of 9 mph in calm water. It takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. Which equation can be used to find c, the speed of the current?

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  1. 28 December, 22:53
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    D=4 (9-c) and d=2 (9+c)

    d=36-4c and d=18+2c

    Since d=d

    18+2c=36-4c add 4c to both sides

    18+6c=36 subtract 18 from both sides

    6c=18 divide both sides by 6

    c=3

    So the speed of the current is 3mph
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