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22 October, 12:12

Amy can mop the store in 30 minutes. James can mop the store in 45 minutes. How long would it take them if they worked together?

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  1. 22 October, 14:00
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    Solve the equation 1/30 + 1/45 = 1/x

    where x is the required time

    multiply thru by 90x:-

    3x + 2x = 90

    x = 90 / 5 = 18

    answer 18 minutes
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