Railway Recruitment Board Mathematics — Question 1714
Question
A can complete a piece of work in 10 days and B in 15 days. Working together, in how many days will they finish it?
- 6
- 5
- 8
- 12
Correct answer
A — 6
Explanation (English)
Combined one-day work = 1/10 + 1/15 = 3/30 + 2/30 = 5/30 = 1/6. So together they finish in 6 days.
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