SOLUTION: 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 t
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Question 91709: 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 ankor@dixie-net.com(22740) (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?
:
Let the completed job (mixing 20 drinks) = 1
:
Let t = time required for all of them to complete the job
: + + = 1
:
Multiply equation by 30 to get rid of the denominators:
6t + 3t + 2t = 30
:
11t = 30
:
t = 30/11 = 2 min 43.6 sec
