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Difficulty—
Source: GMAT Paper Tests
Machine A working alone can complete a job in \(3\dfrac{1}{2}\) hours. Machine B working alone can do the same job in \(4\dfrac{2}{3}\) hours. How long will it take both machines working together at their respective constant rates to complete the job?
A. 1 hour and 10 minutes
B. 2 hours
C. 4 hours and 5 minutes
D. 7 hours
E. 8 hours and 10 minutes
The OA is B
Machine A working alone can complete a job in \(3\dfrac{1}{2}\) hours. Machine B working alone can do the same job in \(4\dfrac{2}{3}\) hours. How long will it take both machines working together at their respective constant rates to complete the job?
A. 1 hour and 10 minutes
B. 2 hours
C. 4 hours and 5 minutes
D. 7 hours
E. 8 hours and 10 minutes
The OA is B
