SOLUTION: a water tank can be filled in 8 minutes and emptied in 9 minutes. if the drain is accidentally left open when the tank is filled, how long does it take to fill the tank?

Question 495049: a water tank can be filled in 8 minutes and emptied in 9 minutes. if the drain is accidentally left open when the tank is filled, how long does it take to fill the tank?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
a water tank can be filled in 8 minutes and emptied in 9 minutes.
if the drain is accidentally left open when the tank is filled, how long does it take to fill the tank?
:
Let t = time in minutes empty the tank with both valves open
let an empty tank = 1
:
- = 1
multiply by 72 to clear the denominators, results:
9t - 8t = 72
t = 72 minutes
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