Pipes and Cisterns Set 3

We are here with Set of questions related to pipes and cisterns which are important for aptitude section of SSC CGL exams.

Q1. Two taps can separately fill a cistern in 10 minutes and 15 minutes, respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in:
(a) 7 minutes
(b) 13 minutes
(c) 9 minutes
(d) 23 minutes
(e) 25 minutes

Q2. Two pipes P and Q would fill a cistern in 24 and 32 minutes, respectively. Both pipes are kept open. When should the first pipe be turned off so that the cistern may be just filled in 16 minutes?
(a) After 10 minutes
(b) After 12 minutes
(c) After 14 minutes
(d) After 16 minutes
(e) None of these

Q3. Two pipes A and B can fill a tank in 15 and 12 hours respectively. Pipe B alone is kept open for 3/4 of time and both pipes are kept open for remaining time. In how many hours, the tank will be full?
(a) 18
(b) 10
(c) 12
(d) 13.5
(e) None of these

Q4. A pipe can fill a tank in 15 minutes and another one in 10 minutes. A third pipe can empty the tank in 5 minutes. The first two pipes are kept open for 4 minutes in the beginning and then the third pipe is also opened. Now in what time will the tank be emptied?
(a) 24 min
(b) 25 min
(c) 20 min
(d) 22 min
(e) None of these

Q5. A cistern has three pipes, A, B and C. the pipes A and B can fill it in 5 and 6 hours respectively and C can empty it in 2 hours. If the pipes A, B and C are opened in order at 2, 3 and 4 p.m. respectively, when will the cistern be empty?
(a) 8:15 p.m.
(b) 11.25 p.m.
(c) 7:15 p.m.
(d) Cannot be determined
(e) None of these

ANSWERS:

1 – C 2 – B 3 – B 4 – C 5 – A

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