SOLUTION: a tank can be filled in 18 hours by pipe A or in 24 hours by pipe B.how long would it take both pipes to fill the tank?

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Question 458190: a tank can be filled in 18 hours by pipe A or in 24 hours by pipe B.how long would it take both pipes to fill the tank?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x/18+x/24=1
x/3+x/4=6
4x+3x=72
7x=72
x=72/7
x=10.2857