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?
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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
