Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together? ANYBODY KNOW THE ANSWER??

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  1. Jim's rate = Pool/30
    Sue's rate = Pool/45
    Tony's rate = Pool/90

    combined rate = pool/30 + pool/45 + pool/90
    = 6pool/90 = pool/15

    So time working combined = pool/(pool/15) = 15

    it will take 15 minutes.

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