Math

posted by .

A tank is filled in 9 hours and drained in 11 hours. How long will it take to fill the tank if the drain is left half open

• Math -

every hour it fills 1/9 and drains 1/22
1/9-1/22 = 13/198

So, it will take 198/13 = 15.23 hours

Similar Questions

1. math

the fill pipe for a tank can fill the tank in 4 hours and the drain pipe can drain in 2 hours. If both pipes are accidentally opened, how long will it take to empty a half-filled tank?
2. math

A tank fitted with two pipes is to filled with water. One pipe can fill it in 5 hours. After it has been open for 3 hours, the second pipe is opened and the tank is filled in 4 hours more. How long it would take the second pipe alone …
3. math

a tank can be filled by one pipe in 3 .5 hours and emptied by another in 4.2 hours.if both ipes are running, how long will it take to fill an empty tank?
4. math

a tank can be filled by one pipe in 3.5 hours and emptied by another in 4.2 hours. if both pipes are running, how long will take to fill an empty tank ?
5. Algebra

There is a water tank with a drain of an unknown size that is always open. There is a series of input pipes above it which are all the same size. When 4 pipes are on, it takes 6 hours to fill. When 3 pipes are on, it takes 10 hours …
6. algebra

a tank used to operate equipment can be filled with air in 3 hours. when the outlet valve is open, the same tank can be emptied in 5 hours. if the tank is filled with the outlet valve open approximately how long will it take to fill …
7. math

A tank is filled in 9 hours and drained in 11 hours. How long will it take to fill the tank if the drain is left half open
8. Math

A tank is filled with an intake pipe that will fill it in 5 hours and an outlet pipe that will empty it in 15 hours. If both pipes are left open, how long will it take to fill the empty tank?
9. Math

It takes 15 minutes to fill a large water tank. However, the tank has a small leak that would completely drain the tank in 4 hours. How long will it take to fill the tank if the leak is not plugged?
10. Algebra

) An inlet pipe can fill an empty tank in 5 hours by itself, and an outlet pipe can drain the same tank when full in 7 hours by itself. If the tank is two-thirds full when the valves for both pipes are opened, how many minutes will …

More Similar Questions