Two taps A and B can fill a tank in 10 minutes and 15 minutes respectively. In what time will the tank be full if tap B was opened 3 minutes after tap A was opened ?

Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively while a third pipe C can empty the full thank in 20 minutes.All the three pipes are opened in the beginning. However,pipe C is closed 6 minutes before the tank is filled.In what time will the tank be full?

Two taps A and B can fill a tank in 10 hours and 40 hours respectively. In how many hours will the tank be filled, if both the taps were opened simultaneously?

Two taps A and B can fill a tank in 10 hours and 40 hours respectively. In how many hours will the tank be filled, if both the taps were opened simultaneously?

Taps A and B can fill a tank in 15 minutes and 10 minutes, respectively while tap C can empty the full tank in x minutes. If all the three taps are opened together, the tank is filled completely in 8 minutes. Tap C can alone empty {:(3)/(8):} th part of the tank in: