Question

A cistern has two inlet pipes A and B which can fill it in 8 hours and 6 hours , respectivly .An outlet pipe C can empty the full cistern in 4 hours .If the pipes A,B and C are opened simulrantely in the empty cistern ,how much time will they take to fill the cistern completely.

Answer 1

The part of tank can be filled in one hour if all opened simultaneously is=1/8+1/6-1/4=(3+4-6)/24=1/24
The time required to fill the tank if all opened simultaneously is =24 hours.