SOLUTION: If a water tank takes 5 minutes to fill and 7 minutes to empty.If the drain is left open when being filled, how long dose it take to fill the tank.

Question 599515: If a water tank takes 5 minutes to fill and 7 minutes to empty.If the drain is left open when being filled, how long dose it take to fill the tank.
Answer by w_parminder(53) (Show Source): You can put this solution on YOUR website!
Rate of filling the tank = 1/5
Rate of emptying the tank = 1/7
as these two works are exactly opposite in nature, so while filling the tank with its drain open, the combination formula becomes

C = 35/2 = 17.5
So the tank would be filled in 17 min & 30 sec
RELATED QUESTIONS
A water tank can be filled in 7 minutes and emptied in 9 minutes. If the drain is... (answered by stanbon)

A water tank can be filled in 7 minutes and emptied in 10 minutes. If the drain is... (answered by Edwin McCravy)

A water tank can be filled in 5 minutes and emptied in 7 minutes. If the drain is... (answered by Paul)

a water tank can be filled in 8 minutes and emptied in 9 minutes. if the drain is... (answered by ankor@dixie-net.com)

A water tank can be filled in seven minutes and emptied in nine minutes. If the drain is... (answered by solver91311)

A tank can be filled by one inlet pipe in 15 minutes. It takes an outlet pipe 75 minutes (answered by ankor@dixie-net.com)

A tank can be filled by one inlet pipe in 15 minutes. It takes an outlet pipe 75 minutes... (answered by Alan3354)

``Filing a tank. A water tank has an inlet pipe and a drain pipe. A full tank came be... (answered by Alan3354,ankor@dixie-net.com)

When a bathtub faucet is turned on (and the drain is shut), it can fill a tub in 6... (answered by mbarugel)