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# Pipes and cisterns-Hard test 1

21)

If two pipes function together, the tank can be filled in 12 hours. One pipe fills the tank in 10 hours faster than the other pipe. How many hours does the faster pipe take to fill the reservoir?

22)

If two pipes function together, the tank will be filled in 6 hours. One pipe fills the tank 5 hours faster than the other. How many hours does the faster pipe take to fill the tank?

23)

A leak in the bottom of the tank can empty the full tank in 6 hours. An inlet pipe fills at the rate of 4 L per minute. When the tank is full, the inlet is opened and ue to the leak the tank is emptied in 8 hours. Find the capacity of the tank.

24)

A tank has three pipes A, B and C. Pipe A and B can fill the tank in 3 and 4h respectively. While pipe C can empty the completely filled tank in 1 hour. If all the pipes are opened in order at 3 pm, 4 pm and 5 pm respectively at what time the cistern will be empty?

[SSC 2007]

25)

If three taps are opened together, a tank is filled in 12 hours. One of the taps can fill it in 10 hours and another in 15 hours. What is the working nature of the third pipe and how does it work?