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

Question 610761: 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?
I keep doing 20/5+20/10+20/15=1/x
and cant seem to get there - what's wrong w/ my formula??
Thanks a million for your help :)
Trish
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
your equation calculates the time for the three of them to make one drink (1/x), try using 20/x
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