A cistern can be filled by one tap in 4 hours and by another in 3 hours. How long will it take to fill it if both taps are opened together ?

A cistern can be filled by a tap in 6hours and emptied by an outlet pipe in 8 hours.How long will it take to fill the cistern if both the tap and the pipe are opened together?

Tap A can fill a cistern in 8 hours and tap B can empty it in 12 hours.How long will it take to fill the cistern if both of them are opened together?

One tap can fill a cistern in 2 hours and another can other can empty the cistern in 3 hours. How long will they take to fill the cistern if both the taps are opened ?

A tap A can fill a cistern in 8 hours while tap B can fill it in 4 hours. In how much time will the cistern be filled if both A and B are opened together?

Two tap can fill a cistern in 8 hours and 10 hours respectively.A third tap can empty it in 6 hours.How long will they take to fill the cistern if all the taps are opened.