Tap A can fill a tank in 9 hours and tap B can fill the same tank in 6 hours. Tap C can empty the same full tank in 4 hours. If all the taps are opened together, then what portion of the tank will be filled after 6 hours?

Tap A can fill a tank in 9 hours and tap B can fill the same tank in 6

1.	Tap A can fill a tank in 9 hours and tap B can fill the same tank in 6 hours. Tap C can empty the same full tank in 4 hours. If all the taps are opened together, then what portion of the tank will be filled after 6 hours?
A.	1/5
B.	1/15
C.	1/6
D.	1/18
Answer» D. 1/18