A, B, and C can complete a job in 10 days working together. A alone takes 30 days and B alone takes 20 days. How long will C take alone?
A40 days
B50 days
C60 days
D80 days
Explanation
C’s rate = Combined rate – (A’s rate + B’s rate) = 1/10 – (1/30 + 1/20) = 1/10 – 5/60 = 1/60 per day. C takes 60 days.
Exam Relevance
- Topic: Age Problems, Time & Distance, Work
- Subtopic: Work & Efficiency
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