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10 February, 08:02

Left on together, the cold and hot water faucets of a certain bathtub take 8 minutes to fill the tub. If it takes the cold water faucet 18 minutes to fill the tub by itself, how long will it take the hot water faucet to fill the tub on its own

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  1. 10 February, 10:16
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    Cf=cold faucet rate

    hf=hot faucet rate

    cf*18min=1 tub

    (cf+hf) * 8min=1 tub

    cf+hf=1tub/8min

    cf=1tub/18min

    hf = (1/8-1/18) tubs per minute

    hf=5/72

    It takes 14.4 minutes.
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