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?
1
1/5
2
1/15
3
1/6
4
1/18
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?