Competitive Exams : Quantitative Aptitude - Pipes and Cistern (Set 3) | Concept of Maths

Question 1

Pipe A can fill a pool in 6 hours, while Pipe B can fill it in 12 hours. If both pipes are opened together, how many hours will it take to fill the pool?

Accepted Answer

B) 4 hours

Answer

A) 3 hours

Answer

C) 5 hours

Answer

D) 8 hours

Question 2

An inlet pipe can fill a cistern in 8 hours, and an outlet pipe can empty it in 16 hours. If both are opened together, how long will it take to fill the cistern?

Accepted Answer

C) 16 hours

Answer

A) 12 hours

Answer

B) 14 hours

Answer

D) 24 hours

Question 3

Pipe X fills a tank in 5 hours and Pipe Y fills it in 20 hours. If both operate simultaneously, how many hours are needed to fill the tank?

Accepted Answer

A) 4 hours

Answer

B) 6 hours

Answer

C) 8 hours

Answer

D) 10 hours

Question 4

A large tank can be filled by Pipe A in 10 minutes and emptied by Pipe B in 30 minutes. If both pipes are opened, how long does it take to fill the tank?

Accepted Answer

B) 15 minutes

Answer

A) 12 minutes

Answer

C) 20 minutes

Answer

D) 25 minutes

Question 5

Pipe P can fill a reservoir in 4 hours, Pipe Q in 6 hours, and Pipe R can empty it in 12 hours. If all three pipes are opened together, how many hours will it take to fill the reservoir?

Accepted Answer

B) 3 hours

Answer

A) 2 hours

Answer

C) 4 hours

Answer

D) 5 hours

Question 6

A container is filled by Pipe A in 15 minutes and by Pipe B in 30 minutes. If they are used together, how many minutes will it take to fill the container?

Accepted Answer

B) 10 minutes

Answer

A) 8 minutes

Answer

C) 12 minutes

Answer

D) 15 minutes

Question 7

An outlet pipe can empty a full tank in 10 hours. If an inlet pipe that can fill the tank in 15 hours is also opened, how long will it take to empty the full tank?

Accepted Answer

C) 30 hours

Answer

A) 20 hours

Answer

B) 25 hours

Answer

D) 35 hours

Question 8

Pipe A can fill a small pool in 2 hours, and Pipe B can fill it in 3 hours. If both are opened at the same time, how many hours will it take to fill the pool?

Accepted Answer

A) 1.2 hours

Answer

B) 1.5 hours

Answer

C) 1.8 hours

Answer

D) 2.2 hours

Question 9

A cistern has a leak that can empty it in 8 hours. An inlet pipe fills it at a rate that would fill it in 12 hours. If the cistern is full, how long will it take to empty with both the leak and the inlet open?

Accepted Answer

C) 24 hours

Answer

A) 16 hours

Answer

B) 20 hours

Answer

D) 30 hours

Question 10

Pipe M can fill a vat in 12 minutes and Pipe N can fill it in 24 minutes. If both are opened together, how long will they take to fill the vat?

Accepted Answer

B) 8 minutes

Answer

A) 6 minutes

Answer

C) 10 minutes

Answer

D) 12 minutes

Question 11

A water tank is filled by a tap in 5 hours, but because of a leak at the bottom, it takes 6 hours to fill. How long will the leak take to empty a full tank?

Accepted Answer

D) 30 hours

Answer

A) 15 hours

Answer

B) 20 hours

Answer

C) 25 hours

Question 12

Pipe A fills a tank in 9 hours, and Pipe B fills it in 18 hours. If they are opened together, how many hours will it take to fill the tank?

Accepted Answer

B) 6 hours

Answer

A) 5 hours

Answer

C) 7 hours

Answer

D) 8 hours

Question 13

A cistern is filled by Pipe X in 4 hours and emptied by Pipe Y in 5 hours. If both are opened, how long will it take to fill the cistern?

Accepted Answer

C) 20 hours

Answer

A) 10 hours

Answer

B) 15 hours

Answer

D) 25 hours

Question 14

If two inlet pipes can fill a tank in 10 hours and 40 hours respectively, how long will they take to fill the tank when working together?

Accepted Answer

B) 8 hours

Answer

A) 6 hours

Answer

C) 10 hours

Answer

D) 12 hours

Question 15

Pipe A can fill a container in 3 minutes, Pipe B can fill it in 4 minutes, and Pipe C can empty it in 6 minutes. If all three are opened together, how long will it take to fill the container?

Accepted Answer

B) 2.4 minutes

Answer

A) 2 minutes

Answer

C) 3 minutes

Answer

D) 3.6 minutes

Question 16

A pool is filled by Pipe A in 12 hours and Pipe B in 6 hours. If both are opened, how much of the pool is filled in 2 hours?

Accepted Answer

A) Half

Answer

B) One-third

Answer

C) Two-thirds

Answer

D) Three-quarters

Question 17

An inlet pipe fills a tank in 8 hours. If the tank is already half full, how many hours will it take the pipe to fill the remaining half?

Accepted Answer

C) 4 hours

Answer

A) 2 hours

Answer

B) 3 hours

Answer

D) 5 hours

Question 18

Pipe A can fill a tank in 15 hours. Due to a leak, it takes 20 hours to fill the tank. How many hours will the leak take to empty the full tank?

Accepted Answer

C) 60 hours

Answer

A) 40 hours

Answer

B) 50 hours

Answer

D) 80 hours

Question 19

Two pipes can fill a tank in 20 minutes and 30 minutes respectively. If both pipes are opened together, how long will they take to fill the tank?

Accepted Answer

B) 12 minutes

Answer

A) 10 minutes

Answer

C) 15 minutes

Answer

D) 18 minutes

Question 20

Pipe A can fill a reservoir in 10 hours, and Pipe B can empty it in 20 hours. If both pipes are opened, what fraction of the reservoir is filled after 5 hours?

Accepted Answer

A) One-fourth

Answer

B) One-third

Answer

C) Half

Answer

D) Three-fourths