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20 August, 16:14

shawna can pour a large concrete driveway in six hours. Dan can pour the same driveway in seven hours. Find how long it would take them if they worked together?

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  1. 20 August, 16:42
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    work in rates per hour : -

    1/6 + 1/7 = 1/x

    Multiply through by the LCD, 42x:-

    7x + 6x = 42

    x = 42 / 13 = 3.23 hours answer

    or about 3 hours 14 minutes
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