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Three machines operating independently, simultaneously, and at the same constant rate can fill a certain production order in 36 hours. If one additional machine were used under the same operating conditions, in how many fewer hours of simultaneous operation could the production order be fulfilled?
A. 6
B. 9
C. 12
D. 27
E. 48
The OA is B
Source: GMAT Prep
A. 6
B. 9
C. 12
D. 27
E. 48
The OA is B
Source: GMAT Prep
