# Pipes and Cistern – Aptitude Questions and Answers

## Pipes and Cistern – Aptitude Questions and Answers:-

This is aptitude on Pipes and Cisterns Problems Question and answers with explanation for different interviews and competitive and entrance exams.

1) A tap can fill a cistern in 20 minutes and another can fill it in 30 minutes. If both are opened simultaneously , Find the time when the cistern will be full.

A) 15 min
B) 12 min
C) 14 min
D) 16 min

2) A tap can fill a tank in 25 minutes and another can empty it in 50 minutes. If both are opened simultaneously , in how many minutes the tank is filled?
A) 25 min
B) 40 min
C) 44 min
D) 50 min

3) A drain pipe can empty 5/6 of cistern in 20 minutes. In 9 minutes , what part of cistern will be emptied?
A) 3/8
B) 2/5
C) 1/8
D) 1/4

4) A pipe can fill a tank in 4 1/2 hours . Because of leakage it takes 1/2 hours more time. If the tank is full , how long would the leakage empty the full cistern?
A) 30 hours
B) 45 hours
C) 35 hours
D) 15 hours

5) Two pipes A and B can fill a cistern in 12 minutes and 18 minutes respectively. They are turned off at the same time. If the tap A is turned off after 4 minutes , how long will tap B take to fill the rest of the cistern?
A) 9 min
B) 6 min
C) 8 min
D) 12 min

6) A cistern is filled in 9 hours and it takes 10 hours when these is a leak in its bottom. If the cistern is full , in what time shall the leak empty it?
A) 80 hours
B) 90 hours
C) 92 hours
D) 100 hours

7.A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 4 liters a minute into the cistern, and it is emptied in 24 minutes. How many liters does the cistern hold?
A. 480 liters
B. 600 liters
C. 720 liters
D. 800 liters

8.Two pipes A and B can separately fill a cistern in 10 and 15 minutes respectively. A person opens both the pipes together when the cistern should have been was full he finds the waste pipe open. He then closes the waste pipe and in another 4 minutes the cistern was full. In what time can the waste pipe empty the cistern when fill?
A. 7 min
B. 8 min
C. 9 min
D. 10 min

9.Three pipes of same capacity can fill a tank in 8 hours. If there are only two pipes of same capacity, the tank can be filled in.
A. 17 hours
B. 12 hours
C. 16 hours
D. 24 hours

10.Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes and 10 minutes respectively. When the tank is empty, all the three pipes are opened. A, B and C discharge chemical solutions P, Q and R respectively. What is the proportion of solution R in the liquid in the tank after 3 minutes?
A. 5/11
B. 6/11
C. 7/11
D. 8/11