7 taps of the same size fill a tank in 1 hour 36 minutes. How long will 8 taps of the same size take to fill the tank?

12 pipes, all of the same size, fill a tank in 42 minutes. How long will it take to fill the same tank,if 21 pipes of the same size are used ?

6 pipes can fill a tank in 1 hour 24 minutes. How long will it take to fill the tank if 7 pipes of the same type are used?

8 taps of the same size fill a tank in 27 minutes. If two taps go out of order, how long would the remaining taps take to fill the tank?

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

Two taps running together can fill a tank in 3(1/13) hours. If one tap takes 3 hours more than the other to fill the tank, then how much time will each tap take to fill the tank ?

Two taps running together can fill a tank in 3(1/13) hours. If one tap takes 3 hours more than the other to fill the tank, then how much time will each tap take to fill the tank ?

Two water taps together can fill a tank in one hour and twelve minutes. The tap of smaller diameter takes 1 hour more than the larger one to fill the tank separately. Find the time in which each tap can separately fill the tank.

Three taps A, B, C can fill an overhead tank in 4, 6 and 12 hours respectively. How long would the three taps take to fill the tank if all of them are opened together ?

Three taps A, B, C can fill an overhead tank in 4. 6 and 12 hours respectively. How long would the three taps take to fill the tank, if all of them are opened together?