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Two pipes A and B can fill a tank in 12 ...

Two pipes A and B can fill a tank in 12 and 16 minutes respectively. Both pipes are opened together, but 4 min before the tank is full, pipe A is closed. In how many minutes will the tank be full?
(A) 9 min B sec
(B) 10 min 9 sec
(C) 11 min 19 sec
(D) 11 min 29 sec

A

C

B

A

C

B

D

D

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