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16 September, 04:53

Dave can complete a sales route by himself in 4 hours. James can do the same job in 5 hours. How long will it take them to do it working together?

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  1. 16 September, 05:15
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    X/4 + x/5 = 1

    5x/20 + 4x/20=1

    9x/20 = 1

    9x = 20

    x = 2.22 hours
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