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One pipe can fill a swimming pool in 8 hours. Another pipe takes 12 hours. How long will it take to fill the pool if both pipes are used simultaneously?

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  1. let t equal the fill time

    the pipes each fill a fraction of the pool
    the fractions sum to one (the whole pool)

    one fraction is t/8
    the other is t/12

    t/8 + t/12 = 1

    24 is the LCD

    3t + 2t = 24

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  2. 4.8 hrs

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  3. Isnt five divided by 24 invalid?

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  4. I don't know because I need it for RSM

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