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Total No Of Questions: 30.
1) Two pipes can fill half of the tank in 20 minutes. If one of the pipe fills the whole tank in 60 minutes, find the time taken by the other pipe to fill the tank individually?

2) 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?

3) 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?

4) Pipe P can fill an empty tank in 5 hours while pipe Q can empty the full tank in 8 hours. If both are opened in that empty tank, in how much time the tank will be filled?

5) A tap can fill a cistern in 16 hours and another can empty it in 32 hours. If both the taps are opened simultaneously,find the time (in hours) to fill the tank.

6) Two taps can fill an empty tank in 36 minutes and 60 minutes respectively. A third tap can empty the full tank in 90 minutes. At what time will an empty tank be filled if all the three are opened simultaneously at 8.50 A.M.?

7) 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?

8) Three taps can fill a cistern in 10, 15 and 18 minutes respectively. In an empty cistern all the three taps are kept open and after three minutes the third tap is closed. In how many minutes more will the cistern be full?

9) A tank has a leak, which could empty it in 8 hours. A tap is turned on which admits 6 litres a minute into the cistern and it is now emptied in 12 hours. How many litres does the cistern hold?

10) 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?
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