# 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

Q1. **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 the 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
Q2. **Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:**

1.  30/17 hours
2.  30/11 hours
3.  60/17 hours
4.  9/2 hours

Solution : 60/17 hours

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Q3. **A pump can fill a tank with water in 2 hours. Because of a leak, it took 7/3 hours to fill the tank. The leak can drain all the water of the tank in:**

1.  13/3 hour
2.  7 hour
3.  8 hour
4.  14 hour

Solution : 14 hour
Q4. **A tank is filled by three pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The second pipe fills the tank 5 hours faster than the first pipe and 4 hours slower than the third pipe. The time required by the first pipe is:**

1.  6 hours
2.  10 hours
3.  15 hours
4.  30 hours

Solution : 15 hours

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Q5. **Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:**

1.  60 gallons
2.  100 gallons
3.  120 gallons
4.  180 gallons

Solution : 120 gallons
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