Two pipes A,B can fill a tank in 24 min. and 32 min. respectively. If both the pipes are opened together, after how much time B should be closed so that the tank is full in 18 min.?

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Two pipes A,B can fill a tank in 24 min. and 32 min. respectively. If both the pipes are opened together, after how much time B should be closed so that the tank is full in 18 min.?