SOLUTION: Using a small inlet pipe, it takes 9 hours to fill a pool. Using a large inlet pipe, it only takes 3 hours to fill the same pool. If both are used simultaneously, how long will it

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Using a small inlet pipe, it takes 9 hours to fill a pool. Using a large inlet pipe, it only takes 3 hours to fill the same pool. If both are used simultaneously, how long will it       Log On


   



Question 807645: Using a small inlet pipe, it takes 9 hours to fill a pool. Using a large inlet pipe, it only takes 3 hours to fill the same pool. If both are used simultaneously, how long will it take to fill the pool?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x/3+x/9=1
4x/9=1
4x=9
x=9/4
together 2 1/4 hours