A can finish a work in 10 days and B in 15 days. Working together, how many days will they take?
A5 days
B6 days
C7.5 days
D8 days
Explanation
Combined rate = 1/10 + 1/15 = (3 + 2) / 30 = 5/30 = 1/6 work/day. Days required = 6 days.
Exam Relevance
- Topic: Age Problems, Time & Distance, Work
- Subtopic: Work & Efficiency
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