SOLUTION: A hose takes 15 minutes to fill a swimming pool and the drain empties the pool in twenty minutes. How long will it take to fill the pool if the drain is accidentally left open?

Algebra ->  Rate-of-work-word-problems -> SOLUTION: A hose takes 15 minutes to fill a swimming pool and the drain empties the pool in twenty minutes. How long will it take to fill the pool if the drain is accidentally left open?       Log On


   

Question 621720: A hose takes 15 minutes to fill a swimming pool and the drain empties the pool in twenty minutes. How long will it take to fill the pool if the drain is accidentally left open?
I need to know how you got the answer also! Please help!!
Found 2 solutions by lynnlo, Alan3354:
Answer by lynnlo(4176) About Me  (Show Source):
You can put this solution on YOUR website!
it can not be filled

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A hose takes 15 minutes to fill a swimming pool and the drain empties the pool in twenty minutes. How long will it take to fill the pool if the drain is accidentally left open?
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Each minute, the hose adds 1/15 of the pool, and 1/20 is lost out the drain.
--> (1/15 - 1/20) per minute net gain
= 1/60 of the pool per minute
--> 60 min/pool
60 minutes to fill