One pipe can fill a tank in 20 minutes, while
another takes 30 minutes to fill the same tank.
How long would it take the two pipes together
to fill the tank?

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  1. rate of first = 1/20
    rate of 2nd = 1/30
    combined rate = 1/20 +1/30 = 1/12

    time to fill at combined rate = 1/(1/12) = 12

    It will take 12 minutes.

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