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1. |
Working together, A and B can do a job in 6 days. B and C can do the same job in 10 days, while C and A can do it in 7.5 days. How long will it take if all A, B and C work together to complete the job? |
A. | 4 days |
B. | 3 days |
C. | 6 days |
D. | 5 days |
E. | None of these |
Answer» E. None of these | |