A, B, and C can complete a piece of work in 10, 12, and 15 days respectively. In how many days can they finish it together?
A3 days
B4 days
C5 days
D6 days
Explanation
1-day work = 1/10 + 1/12 + 1/15 = (6 + 5 + 4) / 60 = 15 / 60 = 1/4. Days taken together = 4 days.
Exam Relevance
- Topic: Work and Time
- Subtopic: Combined Work
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