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Two pipes AS and B can fill a tank in...

Two pipes AS and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank? `10min20\ s e c` b. `11min45\ s e c` c. `12min30\ s e c` d. `\ 14min40\ s e c`

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