Machine A, operating alone at its constant rate produces 500 feet of a particular fiber in 2 hours. Machine B, operating

GMAT Prep

Machine A, operating alone at its constant rate, produces 500 feet of a particular fiber in 2 hours. Machine B, operating alone at its constant rate, produces 500 feet of the same fiber in 3 hours. Machine C, operating alone at its constant rate, produces 500 feet of the same fiber in 5 hours. How many hours will it take Machine A, B, and C, operating together at their respective constant rates, to produce 1,000 feet of fiber?

A. 60/31
B. 15/7
C. 25/11
D. 10/3
E. 20/3

OA A

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