Railway Recruitment Board Mathematics — Question 1717
Question
One pipe fills a tank in 6 hours while another empties it in 8 hours. If both are opened together, in how many hours will the tank be filled?
- 12
- 48
- 24
- 10
Correct answer
C — 24
Explanation (English)
Net filling rate per hour = 1/6 − 1/8 = 4/24 − 3/24 = 1/24. So the tank fills in 24 hours.
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