1 . Working alone Abu can finish a job in 40 days. Labu can do the same job in 60 days working alone. They start working together and work for 18 days. Then Harun joined them. The three men working together finished the job in 5 more days. In how many days could Harun finish the job working alone?
- A. 120
- B. 80
- C. 72
- D. 96
- D. None of them
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