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30 March, 21:44

Marco can build a computer twice as fast as Cliff. Working together, it takes them 5 hours. How long would it have taken Marco working alone?

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  1. 31 March, 01:29
    0
    7.5 hours

    Step-by-step explanation:

    Let Marco's speed be M

    Cliff's speed be C

    M = 2C

    Combined speed:

    M + C

    2C + C = 3C

    3C = W/time

    3C = W/5

    W = 15C

    2C = 15C/time

    Time = 15/2 = 7.5 hours
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