Competitive Exams : Quantitative Aptitude - Pipes and Cistern (Set 1) | Concept of Maths

Question 1

Two pipes A and B can fill a tank in 10 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

Answer

A) 5 hours

Answer

C) 7 hours

Answer

D) 8 hours

Question 2

Pipe A can fill a tank in 12 hours, and Pipe B can empty the same tank in 24 hours. If both are opened together, in how many hours will the tank be filled?

Accepted Answer

C) 24 hours

Answer

A) 12 hours

Answer

B) 18 hours

Answer

D) 36 hours

Question 3

Three pipes A, B, and C can fill a tank in 4, 6, and 12 hours respectively. If all three are opened together, how long will it take to fill the tank?

Accepted Answer

A) 2 hours

Answer

B) 3 hours

Answer

C) 4 hours

Answer

D) 5 hours

Question 4

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

Accepted Answer

D) 16 hours

Answer

A) 10 hours

Answer

B) 12 hours

Answer

C) 14 hours

Question 5

Pipe X can fill a container in 5 hours and Pipe Y can empty it in 10 hours. If both pipes are opened together, in how many hours will the container be full?

Accepted Answer

C) 10 hours

Answer

A) 5 hours

Answer

B) 8 hours

Answer

D) 12 hours

Question 6

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

Accepted Answer

B) 12 minutes

Answer

A) 10 minutes

Answer

C) 15 minutes

Answer

D) 18 minutes

Question 7

Pipe A fills a tank in 6 hours, and Pipe B fills the same tank in 12 hours. If both pipes are opened together, how many hours will they take to fill half of the tank?

Accepted Answer

B) 2 hours

Answer

A) 1 hour

Answer

C) 3 hours

Answer

D) 4 hours

Question 8

A tap can fill a bucket in 15 minutes, but due to a leak at the bottom, it takes 20 minutes to fill. If the bucket is full, how long will the leak take to empty it?

Accepted Answer

D) 60 minutes

Answer

A) 40 minutes

Answer

B) 45 minutes

Answer

C) 50 minutes

Question 9

Two taps can fill a tub in 8 minutes and 12 minutes respectively. If both are opened together, what fraction of the tub is filled in 3 minutes?

Accepted Answer

B) 5/8

Answer

A) 1/2

Answer

C) 3/4

Answer

D) 7/8

Question 10

Pipe A can fill a tank in 10 hours, and Pipe B can fill it in 15 hours. Pipe C can empty the full tank in 30 hours. If all three pipes are opened together, how long will it take to fill the tank?

Accepted Answer

C) 7.5 hours

Answer

A) 6 hours

Answer

B) 7 hours

Answer

D) 8 hours

Question 11

If a pipe can fill a reservoir in 4 hours, what part of the reservoir can it fill in 1 hour and 30 minutes?

Accepted Answer

C) 3/8

Answer

A) 1/4

Answer

B) 1/3

Answer

D) 1/2

Question 12

Pipe P can fill a cistern in 15 hours. After opening Pipe P for 5 hours, it is closed, and Pipe Q is opened, which fills the remaining part of the cistern in 20 hours. How long would Pipe Q take to fill the entire cistern alone?

Accepted Answer

B) 30 hours

Answer

A) 25 hours

Answer

C) 35 hours

Answer

D) 40 hours

Question 13

Two pipes A and B can fill a tank in 3 hours and 6 hours respectively. If they are opened on alternate hours starting with A, in how many hours will the tank be full?

Accepted Answer

B) 4 hours

Answer

A) 3 hours

Answer

C) 5 hours

Answer

D) 6 hours

Question 14

A cistern can be filled by an inlet pipe in 10 hours and emptied by an outlet pipe in 20 hours. If both pipes are kept open, what fraction of the cistern is filled in 5 hours?

Accepted Answer

B) 1/4

Answer

A) 1/5

Answer

C) 3/10

Answer

D) 1/2

Question 15

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

Accepted Answer

C) 6 hours

Answer

A) 4 hours

Answer

B) 5 hours

Answer

D) 7 hours

Question 16

A pipe can empty a full tank in 12 minutes. Another pipe can empty it in 24 minutes. If both pipes are opened together, how long will they take to empty the full tank?

Accepted Answer

B) 8 minutes

Answer

A) 6 minutes

Answer

C) 10 minutes

Answer

D) 12 minutes

Question 17

Pipe X can fill a pool in 2 hours, and Pipe Y can fill it in 3 hours. If both are opened together, what percentage of the pool is filled in 1 hour?

Accepted Answer

D) 83.33%

Answer

A) 50%

Answer

B) 66.67%

Answer

C) 75%

Question 18

A tank is filled by Pipe A in 15 minutes and emptied by Pipe B in 30 minutes. If both pipes are opened when the tank is half full, in how many minutes will the tank become completely full?

Accepted Answer

B) 15 minutes

Answer

A) 10 minutes

Answer

C) 20 minutes

Answer

D) 30 minutes

Question 19

Two pipes fill a tank in 10 minutes and 40 minutes respectively. If both pipes are opened together, in how many minutes will they fill the tank?

Accepted Answer

B) 8 minutes

Answer

A) 6 minutes

Answer

C) 10 minutes

Answer

D) 12 minutes

Question 20

A water tank can be filled by a tap in 5 hours, and can be emptied by another tap in 6 hours. If both taps are opened, how long will it take to fill the empty tank?

Accepted Answer

D) 30 hours

Answer

A) 11 hours

Answer

B) 15 hours

Answer

C) 20 hours