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 2 and 8 hours, respectively. Tap C can empty the filled tank in 4 hours. If all the three taps are turned on simultaneously, how much time will it tank to fill the tank completely? (a)3 hours (b) (9)/(2) hours (c) (3)/(8) hours (d) (8)/(3) hours

Two taps A and B can fill a tank in 10 hours and 15 hours, respectively .If both the taps are opened together the tank will be filled in how many hours?

Two taps A and B can fill a tank in 10 hours and 12 hours respectively. There is an outlet tap C. if all the taps are opened together the tank will fill in 30 hours. In how many hours tap C can alone empty the tank.

There are ten taps fitted to a tank. The filling taps that are filling the tank are five in number adn each takes 5 hours to fill the tank. The emptying taps are alos five in number each tap takes 6 hours to empty to tank. In how many hours can the empty tank be filled, if all the taps are opened simultaneously?

If 4 taps can fill a tank in 10 hours, then in how many hours can 6 taps fill the same tank ?

Two taps J and K can fill the tank alone in 60 and 40 hours repectively .If they are opened together ,then in how many hours will the tank be filled ?