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# Pipes and cisterns-Hard test 2

11)

Taps M, N and O are attached with the tank and velocity of water coming through them are 24 liters per hour, 65 liters per hour and 84 liters per hour. M and N are inlets and O is outlet. If all the taps are opend together then the tank is filled in 20 h. Calculate the capacity of the tank.

12)

Two taps A and B can fill a tank in 25 min and 20 min respectively. But the taps are not opened properly, so tap A allows only $\frac{5}{6}$th part of water and tap B allows only $\frac{2}{3}$rd part of water. Now how long will they take to fill the tank?

13)

Three taps X, Y and Z are attached with the tank and velocity of water coming through them are 50 liters per hour, 75 liters per hour and 100 liters per hour. X and Z are inlets and Y is outlet. If all the taps are opend together then the tank is filled in 5 h. Calculate the capacity of the tank.

14)

A cistern can be filled by two pipes in 20 and 30 min respectively. Both pipes being open, when must the first pipe be turned off so that the cistern may be filled in 10 min more?

15)

Pipes M and N can fill a tank in 40 hours and 20 hours respectively. A third pipe O empties the tank in 10 hours. Calculate the time in which the tank will be filled if all the pipes are opened together.