Question 213453: 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?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 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?
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Steven rate: 1/5 job/min
Sue rate: 1/10 job/min
Jack rate: 1/15 job/min
Together rate: 1/x job/min
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Equation:
rate + rate + rate = together rate
1/5 + 1/10 + 1/15 = 1/x
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Solve for "x"
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Cheers,
Stan H.
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