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


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