# Pipes and Cisterns mcqs test 01

1. A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is
the total time taken to fill the tank completely?

2. Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per
minute, AIl the three pipes working together can fell the tank in 15 minutes. The capacity of the tank is:

3. Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the
three pipes are opened together, then the tank will be filled in:

4. Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and
B and are open for one hour each alternately, the tank will be full in:

5. Pipe A can fill a tank in 5 hours, Pipe B in 10 hours and Pipe C in 30 hours. lf all the pipes are open, in
how many hours will the tank be filled?

6. Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used
together, then how long will it take to fill the tank?

7. Two taps A and B can fill a tank in 5 hours and 20 hours respectively. If both the taps are open then
due to a leakage, it took 30 minutes more to fill the tank. If the tank is full, how long will t take for the
leakage alone to empty the tank:

8. Two pipes A and B can fl a tank in 36 hours and 45 hours respectively. If both the pipes are opened
simultaneously, how much time will be taken tò fill the tank?

9. A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the
taps are opened simultaneously, then after how much time will the cistern get filled?

10. A large tanker can be filled by two pipes A and B in 60 minutes respectively, while a third pipe C can
empty the full tank in 6 minutes. A and B are kept open for 5 minutes in the beginning and then C is
also opened. In what time is the cistern emptied?

11. Bucket P has thrice the capacity as bucket Q. It takes 60 turns for bucket P to fill the empty drum.
How many turns it will take for both the buckets P and Q, having each turn together to fill the empty
drum?

12. Two pipes A and B can fill a tank in 15 hours and 20 hours respectively. While a third pipe C can
empty the full tank in 25 hours. All the three pipes are opened in the beginning. After 10 hours, C is
closed. In how much time, will the tank be filled?

13. 12 buckets of water fill a tank when the capacity of each bucket is 13.5 liters. How many buckets will
be needed to fill the same tank, if the capacity of each bucket is 9 liters?

14. An electric pump can fill a tank in 3,hours, Because of a leak in the tank, it took 3.5 hours to fill the
tank. If the tank is full, how much time will the leak take to empty it?

15. Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate
hours and if pipe A is opened first, in how many hours, the tank shall be full?

16. A cistern has two taps which fill it in 12 minutes and 15 minutes respectively. There is also a waste
Pipe in the cistern. When all the three are opened, the empty cistern is full in 20 minutes. How long will
the waste pipe take to empty the full cistern?

17. Two pipes A and B can fill a cistern in 37.5 minutes and 45 minutes respectively. Both pipes are
opened. The cistern will be filled in just half an hour, if the pipe B is turned off after:

18. One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in
36 minutes, then the slower pipe alone ill be able to fill the tank in?

19. Two pipes A and B can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a
third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then
the Cistern is full in 50 minutes. In how much time, the third pipe alone can empty the cistern: