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8 December, 02:08

Working together Jill and Bill can tar a roof in 6.67 hours. Had he done it alone it would have taken Bill 15 hours how long would it take Hill to do alone?

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  1. 8 December, 04:11
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    Found a simple equation.

    h = (a * b) / (a + b)

    h = total hrs with both.

    a = total hrs Bill.

    b = total hrs Jill.

    6.67 = (15 * b) / (15 + b)

    6.67 (15 + b) = 15b

    100.05 + 6.67b = 15b

    100.05 = 8.33b

    b = 10005 / 833 or 12.0108 hrs
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