Two pipes A and B can fill a tank in 6 hours and 8 hours respectively. If both the pipes are opened together, then after how many hours should B be closed so that the tank is full in 4 hours

Two pipes A and B can fill a tank in 6 hours and 8 hours respectively. If both the pipes are opened together, then after how many hours should B be closed so that the tank is full in 4 hours
1). $\frac{2}{3}$ hrs
2). 1 hrs
3). 2 hrs
4). $2\frac{8}{3}$ hrs

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