GMAT Problem Solving
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Source: GWD
Level: 0
Working alone at their respective constant rates, machine A and machine B can fill a certain order in 3 hours and 6 hours, respectively. If the two machines work simultaneously at their respective constant rates, how many hours does it take the two machines to fill 1/2 of that order?
- A
- B
- C 1
- D
- E