Two pipes A and B can fill a cistern in 12 min and 16 min re...

Two pipes A and B can fill a cistern in 12 min and 16 min respectively. Both the pipes are opened together for a certain time but due to some obstruction, the flow of water was restricted to $\frac{7}{8}$ of full flow in pipe A and $\frac{5}{6}$ of full in pipe B. This obstruction is removed after some time and the tank are now filled in 3 min from that moment. How long was it before the full flow?

Course Name: Quantitative Aptitude

1] 8 min
2] 3 min
3] 5.6 min
4] 4.5 min
5] None of these

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