Two pipes A and B can fill a tank with water in 30 minutes and 45 minutes respec

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Two pipes A and B can fill a tank with water in 30 minutes and 45 minutes respectively. The third pipe C can empty the tank in 36 minutes. First A and B are opened. After 12 minutes C is opened. Total time ( in minutes ) in which the tank will be filled up is -

Options:

A . 12 minutes

B . 24 minutes

C . 30 minutes

D . 36 minutes

Answer: Option B

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