WBCS.LIVE practice question

There are three pipes A, B and C in a tank. A and B alone can completely fill the tank in 4 hours and 3 hours respectively, and C can empty the completely filled tank in 2 hours. If all three pipes are opened simultaneously, in an empty tank, then in how much time will the tank be completely filled?

Solve this multiple-choice question and check the correct answer with its explanation below.