# 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

Q46. **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?**

1.  5/11
2.  6/11
3.  7/11
4.  8/11

Solution : 6/11
Q47. **Two pipes A and B can separately fill a cistern in 60 min and 75 min 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 50 min. In how much time, the third pipe alone can empty the cistern?**

1.  90 min
2.  100 min
3.  110 min
4.  120 min

Solution : 100 min

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Q48. **A pump can fill a tank with water in 2 hours. Because of a leak, it took 2 1/3 hours to fill the tank. The leak can drain all the water of the tank in?**

1.  4 1/3 hrs
2.  7 hrs
3.  8 hrs
4.  14 hrs

Solution : 14 hrs
Q49. **Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill cistern. How much time will be taken by A to fill the cistern separately?**

1.  1 hr
2.  2 hrs
3.  6 hrs
4.  8 hrs

Solution : 6 hrs

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Q50. **One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill tank in 36 min, then the slower pipe alone will be able to fill the tank in?**

1.  81 min
2.  108 min
3.  144 min
4.  192 min

Solution : 144 min
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