SOLUTION: If hose A fill up a tank in 20 minutes and hose B fill up a tank in 15 minutes. how long will it take for the hose together to fill up the tank?

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Question 289585: If hose A fill up a tank in 20 minutes and hose B fill up a tank in 15 minutes.
how long will it take for the hose together to fill up the tank?
Answer by richwmiller(17219)   (Show Source): You can put this solution on YOUR website!
x/20+x/15=1
3x+4x=60
7x=60
x=60/7
8x=8 4/7 minutes
60/7/20+60/7/15=1
3/7 +4/7=1
hose a did 3/7 of the work.
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