# Pipes and Cisterns

Pipes and Cisterns: Cistern meaning, Pipes and Cisterns Questions, Solved Problems

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## Online Aptitude Questions with Answers on Pipes and Cisterns

Q21. **Two taps can separately fill a cistern in 10 minutes and 15 minutes respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in?**

1.  7 min
2.  13 min
3.  23 min
4.  9 min

Solution : 9 min
Q22. **A cistern is filled by a tap in 3.5 hours. Due to a leak in the bottom of the cistern, it takes half an hour longer to fill the cistern. If the cistern is full how long will it take the leak to empty it?**

1.  7 hours
2.  8 hours
3.  14 hours
4.  28 hours

Solution : 28 hours

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Q23. **Two pipes A and B can fill a tank in 4 and 5 hours respectively. If they are turned on alternately for one hour each, starting with A, the time taken to fill the tank is?**

1.  2 hrs 15 min
2.  4 hrs 24 min
3.  5 hrs
4.  3 hrs

Solution : 4 hrs 24 min
Q24. **A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in?**

1.  16 hrs
2.  20 hrs
3.  40 hrs
4.  25 hrs

Solution : 40 hrs

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Q25. **A leak in the bottom of a tank can empty the full tank in 6 hours. An inlet pipe fills water at the rate of 4 liters per minute. When the tank is full in inlet is opened and due to the leak the tank is empties in 8 hours. The capacity of the tank is?**

1.  5260 liters
2.  5760 liters
3.  5846 liters
4.  6970 liters

Solution : 5760 liters
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