Pipes and Cistern (Set 7) Quiz - Quantitative Aptitude Questions

Question 1

Two pipes A and B can fill a tank in 12 hours and 15 hours respectively. If both pipes are opened together, how much time will they take to fill the tank?

Accepted Answer

B) 6 hours 40 minutes

Answer

A) 6 hours

Answer

C) 7 hours

Answer

D) 7 hours 20 minutes

Question 2

A cistern can be filled by an inlet pipe in 8 hours and emptied by an outlet pipe in 12 hours. If both pipes are opened simultaneously when the cistern is empty, how long will it take to fill the cistern?

Accepted Answer

C) 24 hours

Answer

A) 16 hours

Answer

B) 20 hours

Answer

D) 30 hours

Question 3

Three pipes P, Q, and R can fill a tank in 10, 12, and 15 hours respectively. If all three are opened together, how long will they take to fill the tank?

Accepted Answer

B) 4 hours

Answer

A) 3 hours

Answer

C) 5 hours

Answer

D) 6 hours

Question 4

A pipe can fill a pool in 6 hours. Due to a leak at the bottom, it takes 8 hours to fill the pool. In how many hours can the leak empty the full pool?

Accepted Answer

C) 24 hours

Answer

A) 18 hours

Answer

B) 20 hours

Answer

D) 28 hours

Question 5

Two pipes X and Y can fill a cistern in 15 minutes and 20 minutes respectively. Both are opened together, but after 4 minutes, pipe X is turned off. What is the total time required to fill the cistern?

Accepted Answer

B) 14 minutes 40 seconds

Answer

A) 12 minutes 20 seconds

Answer

C) 15 minutes

Answer

D) 16 minutes 10 seconds

Question 6

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?

Accepted Answer

A) 3 hours 45 minutes

Answer

B) 4 hours

Answer

C) 4 hours 15 minutes

Answer

D) 4 hours 30 minutes

Question 7

Two pipes can fill a reservoir in 20 and 24 minutes respectively, and a waste pipe can empty 3 gallons per minute. If all three pipes working together can fill the empty reservoir in 15 minutes, what is the capacity of the reservoir?

Accepted Answer

B) 120 gallons

Answer

A) 100 gallons

Answer

C) 150 gallons

Answer

D) 180 gallons

Question 8

Pipe A is three times as fast as Pipe B and is therefore able to fill a cistern in 32 minutes less than Pipe B. Find the time in which both pipes together can fill the cistern.

Accepted Answer

B) 12 minutes

Answer

A) 10 minutes

Answer

C) 15 minutes

Answer

D) 18 minutes

Question 9

A large cistern is filled by pipe A in 4 hours and pipe B in 6 hours. A third pipe C can empty the full cistern in 12 hours. If all three pipes are opened at 8:00 AM, at what time will the cistern be full?

Accepted Answer

C) 11:00 AM

Answer

A) 10:00 AM

Answer

B) 10:30 AM

Answer

D) 11:30 AM

Question 10

A tank has a leak which would empty it in 8 hours. A tap is turned on which admits 6 liters a minute into the tank, and it is now emptied in 12 hours. How many liters does the tank hold?

Accepted Answer

C) 8640 liters

Answer

A) 7200 liters

Answer

B) 8120 liters

Answer

D) 9000 liters

Question 11

Two pipes A and B can fill a tank in 15 hours and 20 hours respectively. They are opened alternately for 1 hour each, starting with pipe A first. In how many hours will the tank be filled?

Accepted Answer

C) 17 hours

Answer

A) 15 hours

Answer

B) 16 hours

Answer

D) 18 hours

Question 12

Three pipes A, B and C can fill a tank in 6 hours. After working together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. How many hours will C alone take to fill the tank?

Accepted Answer

C) 14 hours

Answer

A) 10 hours

Answer

B) 12 hours

Answer

D) 16 hours

Question 13

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:

Accepted Answer

C) 144 minutes

Answer

A) 81 minutes

Answer

B) 108 minutes

Answer

D) 192 minutes

Question 14

A tank is fitted with two pipes. The first pipe can fill it in 10 hours and the second can empty it in 15 hours. If both are kept open alternately for 1 hour each (starting with the filling pipe), how long will it take to fill the tank?

Accepted Answer

A) 55 hours

Answer

B) 56 hours

Answer

C) 58 hours

Answer

D) 60 hours

Question 15

Two pipes A and B can fill a tank in 24 minutes and 32 minutes respectively. If both pipes are opened together, after how many minutes should B be closed so that the tank is full in 18 minutes?

Accepted Answer

B) 8 minutes

Answer

A) 6 minutes

Answer

C) 10 minutes

Answer

D) 12 minutes

Question 16

Tap A can fill a tub in 20 minutes and tap B can fill it in 30 minutes. Both are opened together, but tap B is closed 5 minutes before the tub is filled. Find the total time taken to fill the tub.

Accepted Answer

C) 14 minutes

Answer

A) 11 minutes

Answer

B) 12 minutes

Answer

D) 15 minutes

Question 17

A reservoir has two inlets A and B which can fill it in 12 hours and 15 hours respectively, and an outlet C which can empty it in 20 hours. If all three are opened together, how much time will it take to fill half of the reservoir?

Accepted Answer

B) 5 hours

Answer

A) 4 hours

Answer

C) 6 hours

Answer

D) 8 hours

Question 18

Two pipes A and B can fill a cistern in 9 minutes and 18 minutes respectively. Both pipes are opened together, but 3 minutes before the cistern is full, pipe A is closed. How much time does it take to fill the cistern?

Accepted Answer

C) 8 minutes

Answer

A) 6 minutes

Answer

B) 7 minutes

Answer

D) 9 minutes

Question 19

A tap can fill a tank in 16 minutes and another can empty it in 8 minutes. If the tank is already half full and both the taps are opened together, what will happen to the tank?

Accepted Answer

B) It will be emptied in 8 minutes

Answer

A) It will be filled in 8 minutes

Answer

C) It will be filled in 16 minutes

Answer

D) It will be emptied in 16 minutes

Question 20

Pipe A can fill a tank in 12 hours and Pipe B can fill it in 18 hours. If both are opened together, but Pipe A is closed after 4 hours, how much more time will Pipe B take to fill the remaining part of the tank?

Accepted Answer

B) 8 hours

Answer

A) 6 hours

Answer

C) 10 hours

Answer

D) 12 hours