Pipes A and B can fill a tank in 20 hours and 30 hours respectively and pipe C can empty the full tank in 40 all the pipes are opened together, how 4oc-lii much time will he needed to make the tank full? `10 3/7hou r s` b. `12 4/5hou r s` c. `17 1/7hou r s` d. `19 1/4hou r s`

Pipe A can fill a tank in 20 h while pipe B alone can fill it in 10 h and pipe C can empty the full tank in 30 h . If all the pipes are open together , how much time will be needed to make the tank full ?

Pipe A can fill a tank in 30 min , while pipe B can fill the same tank in 10 min and pipe C can empty the full tank in 40 min. If all the pipes are opened together, how much time will be needed to make the tank full?

Pipes A and B can fill an empty tank in 6 and 8 hours respectively, while pipe C can empty the full tank in 10 hours. If all three pipes are opened together, then the tank will get filled in:

Pipe A can fill a tank in 6 hrs while pipe B alone can fill it in 5 hrs and pipe C can empty the full tank in 8 hrs. If all the pipes are opened together, how much time will be needed to completely fill the tank?

Pipes A and B can fill a tank in 5 and 6 h, respectively. Pipe C can fill it in 30 h. If all the three pipes are opened together, then in how much time the tank will be filled in?

Two pipes A and B can fill a tank in 1 hours and 20 hours respectively while a third pipe Can empty the full tank in 25 hours. All the three pipes are opened in the beginning. After 10 hors C is closed. In how much time will the tank be full? 12 h r s b. 13 h r s c. 16 h r s d. 18 h r s