Two pipes A and B can fill a cistern in 24 minutes and 36 minutes respectively. A water pipe C can empty it in 18 minutes. First A and B are opened, after 6 minutes C is also opened. In how much time the tank is full?

Options
- 48 minutes
- 40 minutes
- 38 minutes
- 50 minutes

CORRECT ANSWER : 48 minutes

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