PIPE AND CISTERN MCQ SET 2
1. Pipe A can fill a tank in 12 minutes; pipe B can fill it in 18 minutes , while pipe C can empty the full tank in 36 minutes . If all the pipes are opened simultaneously , how much time will it take to fill the empty tank completely?
(a) 7 min. 30 sec.
(b) 10 minutes
(c) 9 minutes
(d) 6 minutes
Answer: C
2. Pipes A and B can fill a tank in 18 hours and 27 hours , respectively , whereas pipe C can empty the full tank in 54 hours . All three pipes are opened together , but pipe C is closed after 12 hours . In how much time (in minutes) will the one-third of the remaining part of the tank be filled by A and B together?
(a) 24
(b) 36
(c) 30
(d) 15
Answer: A
3. Two pipes , A and B , can fill a tank in 10 minutes and 20 minutes , respectively . The pipe C can empty the tank in 30 minutes . All the three pipes are opened at a time in the beginning . However , pipe C is closed 2 minutes before the tank is filled . In what time , will the tank be full (in minutes)?
(a) 12
(b) 10
(c) 8
(d) 6
Answer: C
4. Pipes A , B and C can fill a tank in 15 , 30 and 40 hours , respectively . Pipes A , B and C are opened at 6 a.m. , 8 a.m. and 10 a.m., respectively , on the same day . When will the tank be full?
(a) 3:20 p.m.
(b) 11:20 p.m.
(c) 7:20 p.m.
(d) 5:20 p.m.
Answer: A
5. Pipes A , B and C can fill a tank in 30 h , 40 h and 60 h respectively . Pipes A , B and C are opened at 7 a.m., 8 a.m. and 10 a.m. respectively on the same day . When will the tank be full?
(a) 10.00 p.m.
(b) 10:20 p.m.
(c) 9:20 p.m.
(d) 9:40 p.m.
Answer: C
6. Pipes P and Q can completely fill a water tank in 10 hours and 15 hours , respectively . A pipe R can empty a tank filled completely with water in 12 hours . Initially , the tank is empty and only pipes P and Q are opened at 6 a.m. and pipe R is also opened at 9 a.m. . By what time will the tank be completely filled?
(a) 1 p.m.
(b) 2 p.m.
(c) 11 p.m.
(d) 3 p.m.
Answer: D
7. Three pipes P , Q and R can fill a cistern in 40 minutes , 80 minutes and 120 minutes, respectively . Initially , all the pipes are opened . After how much time (in minutes ) should the pipes Q and R be turned off so that the cistern will be completely filled in just half an hour?
(a) 14
(b) 10
(c) 16
(d) 12
ย Answer: D
8. Pipes A and B can fill a tank in 16 hours and 24 hours respectively , and pipe C alone can empty the full tank in x hours . All the pipes were opened together at 10:30 a.m., but C was closed at 2:30 p.m. . If the tank was full at 8:30 p.m. on the same day , then what is the value of x?
(a) 64
(b) 48
(c) 45
(d) 96
Answer: D
9. Pipe A and B can empty a filled tank in 20 hours and 15 hours respectively , while pipe C alone can fill the same tank in x hours . The three pipes have been opened simultaneously and they took 40 minutes to finish the 1/18 part of the tank . The value of x is :
(a) 21
(b) 30
(c) 26
(d) 24
Answer: B
10. Pipe X can fill a tank in 9 hours and Pipe Y can fill it in 21 hours . If they are opened on alternate hours and Pipe X is opened first , in how many hours shall the tank be full?
(a) 10 3/7
(b) 12 3/7
(c) 9 3/7
(d) 11 3/7
Answer: B
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