Railway Recruitment Board Mathematics — Question 669
Question
A pipe fills a tank in 6 hours. Another empties it in 8 hours. Together they fill in how many hours?
- 18
- 20
- 22
- 24
Correct answer
D — 24
Explanation (English)
Fill rate = 1/6, Empty rate = 1/8. Net = 1/6-1/8 = 1/24. Time = 24 hours
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