SOLUTION: If steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mi

Question 299295: If steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, 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? Please, give me the explaination.
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
First find the rate (job/minute) at which each person can work. The job for each of them is to mix 20 drinks.
If Steven can do the job in 5 minutes, he can do of the job in 1 minute.
If SUe can do the job in 10 minutes, she can do of the job in 1 minute.
If Jack can do the job in 15 minutes, he can do of the job in 1 minute.
Working together, they can do of the job in 1 minute.
So it will take them minutes working together.
minutes or 2 minutes and 43.64 seconds.

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