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Pipes A and B are filling pipes while pipe C is an emptying pipe A and B can fill a tank in 72 and 90 minutes respectively. When all the three pipes are opened together, the tank gets filled in 2 hours. A and B are opened together for 12 minutes, then closed and C is opened. The tank will be empty after :

A

15 minutes

B

16 minutes

C

18 minutes

D

12 minutes

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