GMAT Problem Solving
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Source: Manhattan
Level: 3
Mary, Jane, and Lucy are typing a manuscript and are capable of completing the whole manuscript in 
hours if they work together. If Mary alone can type the same manuscript in 10 hours, and Jane is capable of typing the complete manuscript in 6 hours, in how many hours can Lucy type the whole manuscript?
- A
- B
- C 3
- D 5
- E
