Staff Selection Commission Quantitative Aptitude — Question 276
Question
Two pipes can fill a tank in 10 and 15 hours. A drain pipe can empty it in 30 hours. If all open, tank fills in?
- 6 hours
- 7.5 hours
- 8 hours
- 9 hours
Correct answer
B — 7.5 hours
Explanation (English)
Fill rate = 1/10 + 1/15 - 1/30 = (3 + 2 - 1)/30 = 4/30 = 2/15. Time = 15/2 = 7.5 hours
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