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21 November, 23:39

Jane can complete a sales route by herself in 4 hours. Dave can do the same job in 7 hours. How long will it take them to do it working together?

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  1. 22 November, 02:28
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    T/4+t/7=1

    28 (t/4+t/7) = 1

    7t+4t=28

    11t=28

    t=28/11
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