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28 December, 17:24

In still water, a boat averages 12 miles per hour. It takes the same amount of time to travel 14 miles downstream, with the current, as it does 7 miles upstream, against the current. What is the rate of the water's current?

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  1. 28 December, 17:44
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    Down stream = Speed will be added

    Up stream = Speed will be reduced

    14 / (12 + c) = 7 / (12 - c) ... multiply all by 12

    14 (12-c) = 7 (12 + c)

    168 - 14 c = 84 + 7c

    84 = 21 c

    c = 4 miles/second
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