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math

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if Steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, and Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix the 20 drinks?

  • math - ,

    Steve's Rate = 20/5 drinks/minute = 4 dr/min
    Sue's rate = 20/10 d/min = 2 dr/min
    Jack's rate = 20/15 dr/min = 4/3 dr/min

    combined time = 20/(4+2+4/3)
    = 2.73 minutes or
    2 minutes and 44 seconds.

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