# Pipes and Cisterns Questions for IBPS RRB Prelims Exam: 22nd July 2018

**Dear students,**

**Numerical Ability or Quantitative Aptitude**Section has given

**heebie-jeebies**to the aspirants when they appear for a banking examination. As the level of every other section is only getting complex and convoluted, there is no doubt that this section, too, makes your blood run cold. The questions asked in this section are calculative and very time-consuming. But once dealt with proper strategy, speed, and accuracy, this section can get you the maximum marks in the examination. Following is the

**Quantitative Aptitude quiz**to help you practice with the best of latest pattern questions.

**Q1. A water tank normally takes 7 hours to be filled by a tap but because of the leak, it takes another 2 hours. In how many hours will the leak empty a full water tank?**

(a) 20.5 hours

(b) 24.4 hours

(c) 30 hours

(d) 31.5 hours

(e) None of these

**Q2. A cistern can be filled separately by two pipes P and Q in 45 minutes and 35 minutes respectively. A tap R at the bottom can empty the full cistern in 30 minutes. If the tap R is opened 7 minutes after the two pipes P and Q are opened, then after what time from the opening of tap R the cistern becomes full?**

(a) 40th minute

(b) 61st minute

(c) 37th minute

(d) None of these

(e) Can’t determine

**Q3. Tap A fills a tank in 20 minutes while C empties it at 1/3rd the rate at which A fills it. At 12 : 00 noon, A and C are simultaneously started and when the tank is 50% full, tap A is turned off. At what time will the tank be empty?**

(a) 12 : 35 pm

(b) 12 : 45 pm

(c) 12 : 30 pm

(d) 12 : 55 pm

(e) None of these

**Q4. Two pipes X and Y can fill a tank in 6 hours and 9 hours respectively. If they are turned on alternately for one hour each starting with X, then what is the time taken to fill the tank?**

(a) 6.25 hours

(b) 5.66 hours

(c) 7 hours

(d) 8 hours

(e) None of these

**Q5. Four plumbers had to repair 364 taps. At the end of 3 days working 7 hours per day they had repaired 168 taps. In order to speed up the work, 3 more plumbers were added who also worked 7 hours daily. If the efficiency of each of the plumbers is same, how many additional days would it take to complete the task?**

(a) 2 days

(b) 3 days

(c) 4 days

(d) 1 1/2 day

(e) None of these

*Solutions (1-5):***Q6. Pipe A and B can fill a cistern in 10 hours and 15 hours respectively. When a third pipe C which works as an outlet pipe is also open then the cistern can be filled in 18 hours. The outlet pipe can empty a full cistern in:**

(a) 12 hours

(b) 8 hours

(c) 9 hours

(d) 14 hours

(e) None of these

**Q7. A water tank has three taps A, B and C. A fills four buckets in 24 minutes, B fills 8 buckets in 1 hour and C fills 2 buckets in 20 minutes. If all the taps are opened together a full tank is emptied in 2 hours. If a bucket can hold 5 liters of water, what is the capacity of the tank?**

(a) 120 liters

(b) 240 liters

(c) 180 liters

(d) 60 liters

(e) None of these

**Q8. Pipe A basically used as inlet pipe and pipe B is used as outlet pipe. Pipes A and B both are opened simultaneously, all the time. When pipe A fills the tank and B empty the tank, it will take double the time than when both the pipe fill the tank. When pipe B is used for filling the tank, its efficiency remains constant. What is the ratio of efficiency of pipe A and pipe B respectively?**

(a) 3 : 1

(b) 5 : 2

(c) 1 : 3

(d) 3 : 2

(e) None of these

**Q9. Pipe A can fill the tank in 4 hours, while pipe B can fill it in 6 hours working separately. Pipe C can empty whole the tank in 4 hours. He opened the pipe A and B simultaneously to fill the empty tank. He wanted to adjust his alarm so that he could open the pipe C when it was half-filled, but he mistakenly adjusted his alarm at a time when his tank would be 3/4th filled. What is the time difference between both the cases, to fill the tank fully:**

(a) 48 min.

(b) 54 min.

(c) 30 min.

(d) None of these

(e) Can’t be determined

**Q10. Pipe A can fill an empty tank in 30 hours while B can fill it 45 hours. Pipe A and B are opened and closed alternatively i.e., first pipe A is opened, then B, again A and then B and so on for 1 hour each time without any time lapse. In how many hours the tank will be filled when it was empty, initially?**

(a) 36

(b) 54

(c) 48

(d) 60

(e) None of these

**Solutions (6-10):**

**Direction (11-15): What number is wrong according to given number series pattern:**

**Q11. 36, 71, 117, 178, 246, 331**

(a) 71

(b) 117

(c) 246

(d) 178

(e) 331

**Q12. 18, 72, 36, 150, 72, 288**

(a) 72

(b) 288

(c) 150

(d) 36

(e) 18

**Q13. 25, 31, 44, 63, 93, 135**

(a) 31

(b) 44

(c) 93

(d) 63

(e) 135

**Q14. 15, 27, 51, 87, 135, 196**

(a) 87

(b) 27

(c) 15

(d) 51

(e) 196

**Q15. 47, 57, 81, 130, 211, 332**

(a) 57

(b) 130

(c) 211

(d) 332