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28 October, 01:50

A painter can finish painting a house in 7 hours. Her assistant takes 9 hours to finish the same job. How long would it take for them to complete the job if they were working together?

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  1. 28 October, 02:16
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    T/7+t/9=1

    (9t+7t) / 63=1

    16t=63

    t=63/16 hours

    t=3 15/16

    (t=3:56:15)
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