Civil Service Exam Reviewer · Word Problems · hard
Marco can finish a job in 9 days, Ella in 18 days, and a third worker in 18 days. How long will the job take if all three work together?
- 15 days
- 9 days
- 4.5 days
- 64.8 days
Answer
C. 4.5 days
Solution
Combined rate = 1/9 + 1/18 + 1/18 = 2/9 job/day → 4.5 days.
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