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## Pipes and Cisterns Aptitude Questions and Answers – Overview

Quiz Name |
Pipes and Cisterns |

Category |
Aptitude |

Number of Questions |
25 |

Time |
30 Minutes |

Exam Type |
MCQ (Multiple Choice Questions) |

## Pipes and Cisterns Online Test – Practice Now

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**1. Three pumps A, B and C are opened to fill a tank such that B and C can fill the tank alone 18 hours and 12 hours respectively. Pipe A can empty it 15 hours After 5 hours pipe A is closed. Then how many hours the remaining tank will be filled?**

a. None of these

b. 2 hours 50 min

c. 1 hour 45 min

d. 1 hour 15 min.

e. 4 hours 36 min

**Answer: e**

**Explanation:**

**2. one pipe fills a water tank three times faster than another pipe. If the two pipes together can fill the empty tank in 36 min, then how much time will the slower pipe alone take to fill the tank?**

a. 2h 24min

b. 2h

c. 1h 21min

d. 1h 48min

e. None of these

**Answer: a**

**Explanation:**

**3. Two pipes A and B can fill a tank in 40 hrs and 50 hrs respectively while a third pipe C can empty the tank in 60 hrs. If all the pipes are opened together for 20 hrs and then pipe C is closed then in what time the tank can be filled?**

a.

b.

c.

d.

e. None of these

**Answer: a**

**Explanation:**

**4. Two pipes A and B can fill the tank in 40 and 60 minutes respectively. Both the pipes are opened together, after how many minutes should the pipe B be turned off, so that the tank be fill in 30 minutes?**

a. 15 min

b. 20 min

c. 25 min

d. 28 min

e. None of these

**Answer: a**

**Explanation:**

**Direction: Read the following information carefully and answer the given questions. There are four pipes A, B, C and D which can fill an empty tank. Pipe A and D can fill the tank in 20 hours, while Pipe A, B and D can fill the tank in 15 hours. Pipe D is 20% more efficient than B and 40% less efficient than pipe C. The volume of the tank is 300 litres.**

**5. Efficiency of pipe D is how much percent of efficiency of pipe B?**

a. 120%

b. 100%

c. 75%

d. 50%

e. None of these

**Answer: a**

**Explanation:**

**Direction: Read the following information carefully and answer the given questions.**

**There are four pipes A, B, C and D which can fill an empty tank. Pipe A and D can fill the tank in 20 hours, while Pipe A, B and D can fill the tank in 15 hours. Pipe D is 20% more efficient than B and 40% less efficient than pipe C. The volume of the tank is 300 litres.**

**6. What is the ratio of efficiency of pipe B and D together to the efficiency of pipe A and C together?**

a. 10:13

b. 11:19

c. 15:23

d. 19:11

e. None of these

**Answer: b**

**Explanation:**

**7. Pipe A, pipe B and pipe C together can fill a tank in 20 minutes but because of the leak all three pipes take 10 minutes more time to filled the tank completely. Find the time in which leak can empty the full tank.**

a. 45 minutes

b. 40 minutes

c. cannot be determined

d. 60 minutes

e. None of these

**Answer: d**

**Explanation:**

All three pipes and leak together can filled the tank in = 20 + 10 = 30 minutes.

Let capacity of tank = LCM of 20 and 30 = 60 units.

One minutes work of all three pipe = 60/20 = 3 units.

One minutes work of all three pipes and leak = 60/30 = 2 units.

One minutes work of leak = 2 − 3 = −1 units.

Time taken by leak to empty the tank = 60/1 = 60 minutes

**8. Two pipes can separately fill a tank in 20 hrs and 30 hrs respectively. Both the pipes are opened to fill the tank but when the tank is 1/3rd full, a leak develops in the tank through which 1/3rd of the water supplied by both the pipes leak out. What is the total time taken to fill the tank**

a. 12 hr

b. 16 hr

c. 34 hr

d. 26 hr

e. 36 hr

**Answer: b**

**Explanation:**

Let total capacity of tank = LCM of 20 and 30 = 60 units

Efficiency of A = 60/20 = 3 units/hr

Efficiency of B = 60/30 = 2 units/hr

capacity of 1/3 rd of tank = 60/3 = 20 units

Time taken to fill the 1/3 rd of tank = 20/(3+2) = 4 hr

Combined efficiency of pipes after leak developed= (2/3) of (3 + 2) = 10/3 units

Time taken to fill the remaining 2/3rd of the tank = 40/(10/3) = 12 hr

Total time taken to fill the tank =4 hr +12 hr = 16 hrs

**9. Two pipes, one internal E and one external H fill the tank. Pipe H can fill the tank in 4 minutes. If both pipes are opened alternately for one minute each, such that pipe E is opened first and then pipe H and so on., then what is the time required by both the pipes to fill the tank?**

a. 2 minutes

b. 3 minutes

c. 4 minutes

d. 5 minutes

e. 6 minutes

**Answer: e**

**Explanation:**

**10. Three pipes A,B, C can fill a tank in 6 h. After working at it together for 2 h, C is closed and A and B can fill the remaining part in 7 h. The number of hours taken by C alone to fill the tank is**

a. 10

b. 12

c. 14

d. 16

e. None

**Answer: c**

**Explanation:**

**11. Pipes X and Y are filling pipes while pipe Z is an emptying pipe. X and Y can fill a tank in 144 and 180 minutes respectively. When all the three pipes are opened together, the tank gets filled in 4 hours. X and Y are opened together for 24 minutes, then closed and Z is opened. The tank will be empty after:**

a. 15 min

b. 36 min

c. 12 min

d. 16 min

e. None

**Answer: b**

**Explanation:**

**12. Two taps A and B can fill a tank in 15 hours and 12 hours respectively. There is an outlet tap C. If all the taps are opened together then the tank will be filled in 60 hours. In how many hours tap C can alone empty the tank?**

a. 60/7

b. 20/3

c. 15/2

d. 30/7

e. None

**Answer: c**

**Explanation:**

**13. Pipe A, B and C together can fill a cistern in 12 hours. All the three pipe are opened together for 4 hours and then C is closed. A and B together take 10 hours to fill the remaining part of the cistern. C alone will fill two – thirds of the cistern in.**

a. 50 hours

b. 60 hours

c. 40 hours

d. 48 hours

e. None

**Answer: c**

**Explanation:**

**14. A, B and c pipes can fill a tank in 6 hrs, 8 hrs and 12 hrs respectively. If A and C are opened for first two hours only and then A is closed while B is opened. Find in how many hours the tank gets full after A is closed?**

a. 4 hours

b. 3 (7/19) Hrs

c. 2 (6/15) Hrs

d. 7 hours

e. None

**Answer: c**

**Explanation:**

**15. Pipe C alone can fill a tank in 12 min while pipe A and pipe B together can fill it in 6 min. when pipe A fills in 1st minute then pipe C fills for next 2 minutes then pipe A and so on, the tank gets filled in 16 min. in how many minutes the fastest pipe alone can fill tank?**

a. 36 min

b. 16 min

c. 12 min

d. 18 min

e. None

**Answer: c**

**Explanation:**

**16. Two pipes C and D can fill a tank in 6hr and 9hr respectively. They are opened alternately for 1 hour each, Starting with C first. In what duration, will the tank be filled?**

a. 6hr

b. 18/5 hr

c. 7hr

d. 5hr

e. None

**Answer: c**

**Explanation:**

Let the Total work = LCM [6,9] = 18 units

C can fill the tank in the first hour =3 units

D can fill the tank in the second hour =2 units

In 2 hrs both can fill the tank = 5 units

In 6 hrs both can fill the tank = 15 units

The last 3 units will be filled by C in 1hr.

Hence total time = 6+1 =7hr.

**17. Pipes A and B can fill a tank in 8 hours and 10 hours respectively and pipe C can empty the full tank in 12 hours. All three pipes are opened together, but pipe A is closed after 4 hours. In how many hours will the remaining part of tank be filled?**

a. 24

b. 30

c. 26

d. 22

e. None

**Answer: c**

**Explanation:**

**18. Pipes A and B can fill a tank in 7 hours and 10 hours respectively and pipe C can empty the full tank in 14 hours. All three pipes are opened together, but pipe A is closed after 4.5 hours. In how many hours will the remaining part of tank be filled?**

a. 24

b. 16

c. 8

d. 12

e. None

**Answer: c**

**Explanation:**

**19. Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?**

a. 10 min. 20 sec

b. 11 min. 45 sec

c. 12 min. 30 sec

d. 14 min. 40 sec

e. None

**Answer: d**

**Explanation:**

Part filled in 4 minutes =4(1/15+1/20) = 7/15

Remaining part =(1-7/15) = 8/15

Part filled by B in 1 minute =1/20 : 8/15 :: 1:x

x = (8/15*1*20) = 1023min = 10min 40sec1023min = 10min 40sec

The tank will be full in (4 min. + 10 min. + 40 sec.) = 14 min. 40 sec

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## Pipes and cisterns Aptitude Questions

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## Pipes and cisterns MZQ Problems with solutions

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