SOLUTION: A pool can be filled with one pipe in 8 hours, whereas a second pipe requires 20 hours to fill the pool. How long would it take to fill the pool with both pipes turned on?

SOLUTION: A pool can be filled with one pipe in 8 hours, whereas a second pipe requires 20 hours to fill the pool. How long would it take to fill the pool with both pipes turned on?

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Question 436643: A pool can be filled with one pipe in 8 hours, whereas a second pipe requires 20 hours to fill the
pool. How long would it take to fill the pool with both pipes turned on?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
x/8+x/20=1
x/2+x/5=4
5x+2x=40
7x=40
x=40/7 hours
x=5 5/7 hrs

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