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TWo pipes A and B can fill a tank in 6 h...

TWo pipes A and B can fill a tank in 6 h and 8 h, 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 h?

A

`frac(2)(3)`h

B

1 h

C

2 h

D

`frac(8)(3)`h

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