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Cognizant Previous Questions on Pipes and Cisterns

Question 1

Time: 00:00:00
A cistern can be filled by a tap in 4 hours while it can be 
emptied by another tap in 9 hours. If both the taps are opened
simultaneously, then after how much time cistern will get filled ?

7 hours

7 hours

7.1 hours

7.1 hours

7.2 hours

7.2 hours

7.3 hours

7.3 hours

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Question 2

Time: 00:00:00
Two pipes A and B can fill a tank in 15 minutes and 20 minutes
respectively. Both the pipes are opened together but after
4 minutes, pipe A is turned off. What is the total time
required to fill the tank?

10 min. 20 sec.

10 min. 20 sec.

11 min. 45 sec.

11 min. 45 sec.

12 min. 30 sec.

12 min. 30 sec.

14 min. 40 sec.

14 min. 40 sec.

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Question 3

Time: 00:00:00
A large tanker can be filled by two pipes A and B in 60 minutes
and 40 minutes respectively. How many minutes will it take to
fill the tanker from empty state if B is used for half the time
and A and B fill it together for the other half?

 

15 min

15 min

20 min

20 min

27.5 min

27.5 min

30 min

30 min

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Question 4

Time: 00:00:00
Three pipes A, B and C can fill a tank in 6 hours. 
After working at it together for 2 hours, C is closed and A
and B can fill the remaining part in 7 hours.
The number of hours taken by C alone to fill the tank is:
Three pipes A, B and C can fill a tank in 6 hours.
After working at it together for 2 hours, C is closed and A
and B can fill the remaining part in 7 hours.
The number of hours taken by C alone to fill the tank is:

10

10

12

12

14

14

16

16

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Question 5

Time: 00:00:00
Two pipes A and B can separately fill a cistern in 40 minutes
and 30 minutes respectively. There is a third pipe in the bottom
of the cistern to empty it. If all the three pipes are
simultaneously opened, then the cistern is full in 20 minutes.
In how much time, the third pipe alone can empty the cistern?
Two pipes A and B can separately fill a cistern in 40 minutes
and 30 minutes respectively. There is a third pipe in the bottom
of the cistern to empty it. If all the three pipes are
simultaneously opened, then the cistern is full in 20 minutes.
In how much time, the third pipe alone can empty the cistern?

120 min

120 min

100 min

100 min

140 min

140 min

80 min

80 min

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Question 6

Time: 00:00:00
Three taps A, B and C can fill a tank in 12, 15 and 20 hours
respectively. If A is open all the time and B and C are open
for one hour each alternately, the tank will be full in:

6 hours

6 hours

6 2/3 hours

6 2/3 hours

7 hours

7 hours

7 1/2 hours

7 1/2 hours

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Question 7

Time: 00:00:00
Three pipes A, B and C can fill a tank in 6 hours. 
After working at it together for 2 hours, C is closed and
A and B can fill the remaining part in 7 hours.
The number of hours taken by C alone to fill the tank is:

10

10

12

12

14

14

16

16

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Question 8

Time: 00:00:00
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?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?

3 hrs 15 min

3 hrs 15 min

3 hrs 45 min

3 hrs 45 min

4 hrs

4 hrs

4 hrs 15 min

4 hrs 15 min

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Question 9

Time: 00:00:00
One pipe can fill a tank 6 times as fast as another pipe. If
together the two pipes can fill the tank in 22 minutes,
then the slower pipe alone will be able to fill the tank in:
One pipe can fill a tank 6 times as fast as another pipe.
If together the two pipes can fill the tank in 22 minutes,
then the slower pipe alone will be able to fill the tank in?

164 min

164 min

154 min

154 min

134 min

134 min

144 min

144 min

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Question 10

Time: 00:00:00
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:

 

 

81 min

81 min

108 min

108 min

144 min

144 min

192 min

192 min

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["Need more practice! \r\n \r\n","Keep trying! \r\n \r\n","Not bad! \r\n \r\n","Good work! \r\n \r\n","Perfect! \r\n \r\n"]
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