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Three copying machines A, B, and C, working together at their respective constant rates, can do a copying work in 2 hours. B and C, working together at their respective constant rates, can do the same copying job in 4 hours. How many hours would it take A, working alone at its constant rate, to do the same job?
A. 2 hours
B. 3 hours
C. 4 hours
D. 5 hours
E. 6 hours
[spoiler]OA=C[/spoiler]
Source: e-GMAT
A. 2 hours
B. 3 hours
C. 4 hours
D. 5 hours
E. 6 hours
[spoiler]OA=C[/spoiler]
Source: e-GMAT
