GRE
Exam
Numerical Ability
Time and Work
Machines A and B always operate independently and at their respective constant rates. When working alone, Machine A can fill a production lot in 3 hours, and Machine B can fill the same lot in x hours. If A and B worked alternatively, while each work for 1 hour at a time, the total work gets completed in 4 hours. What is the value of x? A)8 B)9 C)6 D)5 E)7
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