Pipe and Cistern MCQ Set 2

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

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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

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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

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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.

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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.

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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.

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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

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 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

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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

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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

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Answer: B