A cistern has two pipes. One can fill it with water in 8 hours and other can empty it in 5 hours, in how many hours will the cistern be emptied If both the pipes are opened together when 3/4 of the cistern in already full of water

A cistern has two pipes. One can fill it with water in 8 hours and other can empty it in 5 hours, in how many hours will the cistern be emptied If both the pipes are opened together when 3/4 of the cistern in already full of water
1). $13\frac{1}{3}$ hours
2). 10 hours
3). 6 hours
4). $3\frac{1}{3}$ hours

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