SOLUTION: The full pipe for a tank can fill the tank 45 minutes. The drain pipe can empty the tank in 30 minutes. If both pipes are accidentally left open, how long will it take to empty a f

Question 612037: The full pipe for a tank can fill the tank 45 minutes. The drain pipe can empty the tank in 30 minutes. If both pipes are accidentally left open, how long will it take to empty a full tank?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
The full pipe for a tank can fill the tank 45 minutes. The drain pipe can empty the tank in 30 minutes. If both pipes are accidentally left open, how long will it take to empty a full tank?
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Each minute, 1/45 of the tank is flowing in & 1/30 is flowing out.
--> 1/30 - 1/45 net loss per minute
= 1/90 tank per minute
= 90 minutes/tank

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