Competitive Exams : Quantitative Aptitude - Pipes and Cistern (Set 4) | Concept of Maths

Question 1

Pipe A can fill an empty 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) 6 hours

Question 2

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

Accepted Answer

C) 16 hours

Answer

A) 12 hours

Answer

B) 14 hours

Answer

D) 20 hours

Question 3

Pipe X can fill a cistern in 10 minutes, and Pipe Y can fill it in 15 minutes. If both pipes work together, how long will they take to fill the empty cistern?

Accepted Answer

A) 6 minutes

Answer

B) 5 minutes

Answer

C) 8 minutes

Answer

D) 7 minutes

Question 4

A tap can fill a tank in 5 hours. Due to a small leak at the bottom of the tank, it now takes 6 hours to fill it. How long will the leak alone take to completely empty a full tank?

Accepted Answer

C) 30 hours

Answer

A) 20 hours

Answer

B) 25 hours

Answer

D) 35 hours

Question 5

Two inlets, Pipe A and Pipe B, can fill a storage tank in 20 minutes and 30 minutes respectively. If both inlets are opened together, how much time 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 6

Pipe A can fill a reservoir in 4 hours, and Pipe B can empty it in 6 hours. If both pipes are opened together in an empty reservoir, how many hours will it take to fill it completely?

Accepted Answer

B) 12 hours

Answer

A) 10 hours

Answer

C) 8 hours

Answer

D) 14 hours

Question 7

A cistern can be filled by an inlet tap in 3 hours and emptied by an outlet tap in 9 hours. If both taps are opened at the same time, how long does it take to fill the cistern?

Accepted Answer

A) 4.5 hours

Answer

B) 4 hours

Answer

C) 5 hours

Answer

D) 6 hours

Question 8

Three pipes A, B, and C can fill a water tank in 12, 15, and 20 hours respectively. If all three pipes are opened together, how long will they take to fill the empty tank?

Accepted Answer

B) 5 hours

Answer

A) 4 hours

Answer

C) 6 hours

Answer

D) 8 hours

Question 9

Pipe A can fill a tank in 10 hours, and Pipe B can fill it in 15 hours. If both pipes are opened together, but Pipe A is closed after 2 hours, how many more hours will Pipe B take to fill the remaining part of the tank?

Accepted Answer

A) 10 hours

Answer

B) 12 hours

Answer

C) 13 hours

Answer

D) 11 hours

Question 10

Pipe P can fill a reservoir in 15 hours, and Pipe Q can empty it in 30 hours. If both are opened together in an empty reservoir, how long will it take to fill the reservoir?

Accepted Answer

B) 30 hours

Answer

A) 25 hours

Answer

C) 20 hours

Answer

D) 35 hours

Question 11

If two pipes fill a water tank in 8 hours and 24 hours respectively, what is the combined time they take to fill the tank together?

Accepted Answer

A) 6 hours

Answer

B) 7 hours

Answer

C) 8 hours

Answer

D) 5 hours

Question 12

An outlet pipe can empty a full water tank in 10 hours. If the tank is full and a slower outlet pipe that takes 15 hours to empty is also opened, how long will they take to empty the tank together?

Accepted Answer

B) 6 hours

Answer

A) 5 hours

Answer

C) 8 hours

Answer

D) 4 hours

Question 13

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

Accepted Answer

A) 2.4 hours

Answer

B) 3 hours

Answer

C) 3.5 hours

Answer

D) 4 hours

Question 14

A water tank is normally filled in 9 hours, but it takes 10 hours to fill because of a leak at the bottom. In how many hours can the leak alone empty the full tank?

Accepted Answer

B) 90 hours

Answer

A) 80 hours

Answer

C) 100 hours

Answer

D) 95 hours

Question 15

Pipe M can fill a tank in 12 minutes and Pipe N can fill it in 18 minutes. If both are opened, but Pipe M is closed after 4 minutes, how much longer will it take Pipe N to finish filling the tank?

Accepted Answer

B) 8 minutes

Answer

A) 6 minutes

Answer

C) 5 minutes

Answer

D) 7 minutes

Question 16

A tap can fill a tub in 10 minutes and another tap can empty it in 20 minutes. If both are opened together, in how many minutes will the tub be full?

Accepted Answer

B) 20 minutes

Answer

A) 15 minutes

Answer

C) 25 minutes

Answer

D) 30 minutes

Question 17

If Pipe A is twice as fast as Pipe B, and Pipe B takes 12 hours to fill a tank, how long will they take together to fill the tank?

Accepted Answer

A) 4 hours

Answer

B) 6 hours

Answer

C) 8 hours

Answer

D) 3 hours

Question 18

Pipe A can fill a container in 8 hours, and Pipe B can fill it in 24 hours. How long will they take to fill half of the container if opened together?

Accepted Answer

B) 3 hours

Answer

A) 2 hours

Answer

C) 4 hours

Answer

D) 6 hours

Question 19

Three taps can fill a sink in 20, 30, and 60 minutes respectively. If all are opened together, how long will they take to fill the sink?

Accepted Answer

B) 10 minutes

Answer

A) 12 minutes

Answer

C) 15 minutes

Answer

D) 8 minutes

Question 20

A pipe can fill a tank in 15 minutes. A second pipe can empty it in 5 minutes. If the tank is already full and both pipes are opened, how long will it take to empty the tank?

Accepted Answer

A) 7.5 minutes

Answer

B) 10 minutes

Answer

C) 12 minutes

Answer

D) 15 minutes