Two pipes A and B can separately fill a ...

Two pipes A and B can separately fill a tank in 6 hours and 8 hours , respectively . Both the pipes are opened together , but `1 1/2` hours after the start , the pipe A is turned off. How much time will it take to fill the tank ?

5 hours

6 hours

`4 1/2 ` hours

`5 1/2` hours

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