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9 July, 00:35

A boat has a speed of 9 mph in cold 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. 9 July, 01:34
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    (1) 9*4 - 4c = x

    (2) 9*2 + 2c = x

    ∴ 36 - 4c = 18 + 2c

    18 - 4c = 2c

    9 - 2c = c

    9 = 3c

    c = 3 mph
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