Quantitative Aptitude Time and Work Pipe and Cistern

Pipe A takes 12 hours to fill a huge tank. Pipe B is used to empty the tank. If both pipes A and B are opened, the tank fills in 16 hours. How much time does pipe B take to empty the tank is opened alone?

1

48 hours

2

42 hours

3

40 hours

4

38 hours

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