SOLUTION: Al can wash a car in 60 minutes and Bill can wash a car in 30 minutes. Cathy can wash a car in 20 minutes how long in minutes would it take the 3 of them to wash a car working toge

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Al can wash a car in 60 minutes and Bill can wash a car in 30 minutes. Cathy can wash a car in 20 minutes how long in minutes would it take the 3 of them to wash a car working toge      Log On


   

Question 741518: Al can wash a car in 60 minutes and Bill can wash a car in 30 minutes. Cathy can wash a car in 20 minutes how long in minutes would it take the 3 of them to wash a car working together?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1/60+1/30+1/20=1/x
x=10