3 years ago in Time and Work

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 7/8 of full flow in pipe A and 5/6 of full in pipe B. This obstruction is removed after some time and tank is now filled in 3 min from that moment. How long was it before the full flow.

[A] 8 min
[B] 3 min
[C] 5.6 min
[D] 4.5 min
[E] None of these

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