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# Pipes and cisterns-Hard test 1

11)

Having the same capacity 9 taps fill up a water tank in 20 min. How many taps of the same capacity are required to fill up the same water tank in 15 min?

[SSC CGL (mains) 2014]

12)

A cistern has two pipes, one can fill it with water in 8 hours, other can empty it in 5 hours. In how many hours will the cistern be empties if both the pipes are opened together when three fourth of the cistern is already full of water?

[SSC CGL 2005]

13)

A tank is $\frac{3}{4}$th part full of water. When 30 L of water is taken out the tank become empty. The total capacity of the tank is___

[SSC CGL 2005]

14)

12 pumps working 6 hours a day can empty a completely filled reservior in 15 days. How many such pumps working 9h a day will empty the same reservior in 12 days?

[SSC CGL 2007]

15)

Two pipes A and B can fill a water tank in 12 min and 24 min respectively. Third pipe C can empty at the tank at the rate of 3 gallons per minute. If A, B and C opened together fill the tank in 15 minutes, the capacity of the tank in gallons is___

[SSC CPO 2007]

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