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Total No Of Questions: 30.
1) Three pipes P, Q and R can fill a tank in 6 hours. After working at it together for 2 hours, R is closed and P and Q can fill the remaining part in seven hours. The number of hours taken by R alone to fill the tank is ________

2) A tap can fill a cistern in 12 hours and another empties in 10 hours. If both are opened at the same time, how much time will it take to fill the cistern?

3) Two pipes P and Q can fill a tank in 40 and 60 minutes respectively. When the tank will be filled, if the pipes are opened in alternative minutes starting with pipe P?

4) An electric pump can fill a tank in 3 hours. Because of a leak, it took 3 hour to fill the tank. In how much time the leak can drain the full tank?

5) Two pipes P and Q can fill a cistern in 12 minutes and 18 minutes respectively. They are turned on at the same time.If the tap P is turned off after 4 minutes, how long will tap Q take to fill the rest cistern?

6) Two pipes P and Q can fill a cistern in 1 hour and 75 minutes respectively. There is also an outlet R. If all the three pipes are opened together, the tank is full in 50 minutes. How much time will be taken by R to empty the full tank?

7) Two taps can fill a tank in 12 and 18 minutes respectively. Both are kept opened for 2 minutes and the first is turned off. In how many minutes more will the tank be filled?

8) Two pipes P and Q separately fill a cistern in 7 and 5 minutes respectively and drain pipe R can carry off 14 litres per minute. If all the pipes are opened, when the cistern is full, it is emptied in one hour. How many litres does it hold?

9) Two pipes P and Q can fill a cistern in 10 minutes and 15 minutes respectively. But an empty pipe R can empty it in 5 minutes. The pipes P and Q are opened for 4 minutes and then the empty pipe R is also opened. In what time is the cistern emptied?

10) Two pipes P and Q can fill a cistern in 60 minutes and 80 minutes respectively.Both the taps were opened simultaneously but Q is turned off after 20 minutes. Find the total time required to fill the cistern.
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