A pipe is connected to a tank or a system it is used to fill or empty. This is the amount of work done by a pipe is a part of the tank filled or emptied in unit time three pipes A , B and C are connected to a tank A and B fill the tank in six and eight hours, respectively when operated independently pipes, empty the full tank in 12 hours when opened alone.


I) if both pipes A and B are opened together then the tank can be filled in
II) if pipe A and C at opened then tank can be filled in
III) if pipe B and C at opened together then tank can be filled in
IV) three pipe’s are opened together then the tank can be filled in