Two pipes A and B fill a tank in 4 hours and 6 hours respectively while pipe C empties the tank in 8 hours. If all the pipes A, B and C are started together simultaneously then in how much time will the tank be full?

Two pipes A and B fill a tank in 4 hours and 6 hours respectively while pipe C empties the tank in 8 hours. If all the pipes A, B and C are started together simultaneously then in how much time will the tank be full?
1). 22/7 hours
2). 22/5 hours
3). 24/7 hours
4). None of these

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