SOLUTION: I have a question that says if Jack can mix 20 drinks in 5 minutes, Lisa can mix 20 drinks in 10 minutes, and Jorge can mix 20 drinks in 15 minutes, How long will it take all three

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Question 427814: I have a question that says if Jack can mix 20 drinks in 5 minutes, Lisa can mix 20 drinks in 10 minutes, and Jorge can mix 20 drinks in 15 minutes, How long will it take all three of them to mix 20 drinks. I don't know what equation to put it in to find the answer. Please help.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
I have a question that says if Jack can mix 20 drinks in 5 minutes,
Lisa can mix 20 drinks in 10 minutes, and Jorge can mix 20 drinks in 15 minutes,
How long will it take all three of them to mix 20 drinks.
:
Here is a simple equation you can use to solve this
Let t = time required working all together
Let the completed job = 1 (the mixing of 20 drinks)
t%2F5 + t%2F10 + t%2F15 = 1
You can clear the denominators by multiplying by 30, and solve for t