GRE Problem Solving Question 36
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Source: Kaplan
If it takes Daniel 9 hours to clean an office building and it takes Mark 6 hours, how long would it take the two of them, working together, to clean the building?
- A 3 hours
- B 3 hours 36 minutes
- C 4 hours 45 minutes
- D 6 hours
- E 7 hours 30 minutes