1. Pipe A fills a tank in 8 hours; pipe B (a drain) empties it in 18 hours. If both are open, how long to fill the tank?
Mid- A.17.86 hours
- B.14.40 hours
- C.16.13 hours
- D.12.67 hours
Pipes & Cisterns interview questions
20 real Pipes & Cisterns questions from the Aptitude bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
2. Pipe A fills a tank in 6 hours; pipe B (a drain) empties it in 12 hours. If both are open, how long to fill the tank?
Mid- A.10.56 hours
- B.12 hours
- C.13.44 hours
- D.14.88 hours
3. Pipe A fills a tank in 10 hours; pipe B (a drain) empties it in 24 hours. If both are open, how long to fill the tank?
Mid- A.17.14 hours
- B.21.26 hours
- C.19.20 hours
- D.15.08 hours
4. Pipe A fills a tank in 4 hours; pipe B (a drain) empties it in 24 hours. If both are open, how long to fill the tank?
Mid- A.4.80 hours
- B.5.80 hours
- C.6.80 hours
- D.3.80 hours
5. Pipe A fills a tank in 10 hours; pipe B (a drain) empties it in 15 hours. If both are open, how long to fill the tank?
Mid- A.26.40 hours
- B.37.20 hours
- C.30 hours
- D.33.60 hours
6. Pipe A fills a tank in 4 hours; pipe B (a drain) empties it in 18 hours. If both are open, how long to fill the tank?
Mid- A.4.14 hours
- B.5.14 hours
- C.6.14 hours
- D.7.14 hours
7. Pipe A fills a tank in 6 hours; pipe B (a drain) empties it in 15 hours. If both are open, how long to fill the tank?
Mid- A.11.20 hours
- B.10 hours
- C.8.80 hours
- D.12.40 hours
8. Pipe A fills a tank in 8 hours; pipe B (a drain) empties it in 15 hours. If both are open, how long to fill the tank?
Mid- A.19.20 hours
- B.21.26 hours
- C.17.14 hours
- D.15.08 hours
9. Pipe A fills a tank in 10 hours; pipe B (a drain) empties it in 12 hours. If both are open, how long to fill the tank?
Mid- A.52.80 hours
- B.60 hours
- C.67.20 hours
- D.74.40 hours
10. Pipe A fills a tank in 6 hours; pipe B (a drain) empties it in 24 hours. If both are open, how long to fill the tank?
Mid- A.9 hours
- B.8 hours
- C.10 hours
- D.7 hours
11. Pipe A fills a tank in 8 hours; pipe B (a drain) empties it in 12 hours. If both are open, how long to fill the tank?
Mid- A.24 hours
- B.29.76 hours
- C.21.12 hours
- D.26.88 hours
12. Pipe A fills a tank in 6 hours; pipe B (a drain) empties it in 18 hours. If both are open, how long to fill the tank?
Mid- A.11.16 hours
- B.7.92 hours
- C.9 hours
- D.10.08 hours
13. Pipe A fills a tank in 10 hours; pipe B (a drain) empties it in 20 hours. If both are open, how long to fill the tank?
Mid- A.17.60 hours
- B.22.40 hours
- C.20 hours
- D.24.80 hours
14. Pipe A fills a tank in 4 hours; pipe B (a drain) empties it in 15 hours. If both are open, how long to fill the tank?
Mid- A.5.45 hours
- B.7.45 hours
- C.6.45 hours
- D.4.45 hours
15. Pipe A fills a tank in 6 hours; pipe B (a drain) empties it in 20 hours. If both are open, how long to fill the tank?
Mid- A.7.54 hours
- B.9.60 hours
- C.10.63 hours
- D.8.57 hours
16. Pipe A fills a tank in 8 hours; pipe B (a drain) empties it in 20 hours. If both are open, how long to fill the tank?
Mid- A.11.73 hours
- B.16.53 hours
- C.14.93 hours
- D.13.33 hours
17. Pipe A fills a tank in 8 hours; pipe B (a drain) empties it in 24 hours. If both are open, how long to fill the tank?
Mid- A.14.88 hours
- B.10.56 hours
- C.13.44 hours
- D.12 hours
18. Pipe A fills a tank in 10 hours; pipe B (a drain) empties it in 18 hours. If both are open, how long to fill the tank?
Mid- A.19.80 hours
- B.22.50 hours
- C.27.90 hours
- D.25.20 hours
19. Pipe A fills a tank in 4 hours; pipe B (a drain) empties it in 12 hours. If both are open, how long to fill the tank?
Mid- A.5 hours
- B.7 hours
- C.8 hours
- D.6 hours
20. Pipe A fills a tank in 4 hours; pipe B (a drain) empties it in 20 hours. If both are open, how long to fill the tank?
Mid- A.4 hours
- B.6 hours
- C.5 hours
- D.7 hours
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