Staff Selection Commission Quantitative Aptitude — Question 360

Question

Two pipes can fill a tank in 12 hours and 15 hours. Together in how many hours?

1. 6.67 hours
2. 7 hours
3. 7.5 hours
4. 8 hours

Correct answer

A — 6.67 hours

Explanation (English)

Combined rate = 1/12 + 1/15 = 9/60 = 3/20. Time = 20/3 = 6.67 hours

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