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Pipes and Cisterns Questions and Answers
Q1. Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately ?
A. 1 hr
B. 2 hrs
C. 8 hrs
D. 6 hrs
Q2. Two pipes A arid 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 ?
A. 110 min
B. 100 min
C. 90 min
D. 120 min
Q3. 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 ?
A. 12 min
B. 25 min
C. 15 min
D. 50 min
Q4. 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 C are open for one hour each alternately, the tank will be full in :
A. 6 hrs
B. 7 hrs
C. 20/3 hrs
D. 15/2 hrs
Q5. A cistern can be filled by a tap in 4 hours while it car 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?
A. 7.2 hrs
B. 4.5 hrs
C. 5 hrs
D. 6.5 hrs
Q6. 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 ?
A. 3 hrs 15 min
B. 4 hrs
C. 3 hrs 45 min
D. 4 hrs 15 min
Q7. 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 will be able to fill the tank in :
A. 108 min
B. 144 min
C. 81 min
D. 192 min
Q8. Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes ,are open, in how many hours will the tank be filled ?
A. 3
B. 2
C. 3.5
D. 2.5
Q9. Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is :
A. 10
B. 12
C. 16
D. 14
Q10. A pump can fill a tank with water in 2 hours. Because of a leak, it took  hours to fill the tank. The leak can drain all the water of the tank in :
A. 8 hrs
B. 7 hrs
C. 14 hrs
D. 13/3 hrs
