Railway Recruitment Board Mathematics — Question 1716
Question
A is twice as good a workman as B, and together they finish a piece of work in 18 days. In how many days can B alone finish it?
- 27
- 54
- 36
- 18
Correct answer
B — 54
Explanation (English)
Let B's rate = 1 unit/day, so A's = 2 units/day; together 3 units/day. Total work = 3 × 18 = 54 units. B alone = 54/1 = 54 days.
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