Civil Service Exam Reviewer · Word Problems · medium
Dina can paint a room in 6 hours, while Joy can paint it in 12 hours. How long will it take them working together?
- 4 hours
- 9 hours
- 18 hours
- 5 hours
Answer
A. 4 hours
Solution
Combined rate = 1/6 + 1/12 = 1/4 room/hour. Time = 4 hours.
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