Railway Recruitment Board Mathematics — Question 654
Question
A can complete work in 12 days, B in 15 days. Together they finish in how many days?
- 6 days
- 6.67 days
- 7 days
- 8 days
Correct answer
B — 6.67 days
Explanation (English)
A's rate = 1/12, B's rate = 1/15. Combined = 1/12+1/15 = 9/60 = 3/20. Days = 20/3 = 6.67 days
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