Civil Service Exam Reviewer · Word Problems · medium
Rina can paint a room in 12 hours, while Gino can paint it in 36 hours. How long will it take them working together?
- 9 hours
- 24 hours
- 16 hours
- 10 hours
Answer
A. 9 hours
Solution
Combined rate = 1/12 + 1/36 = 1/9 room/hour. Time = 9 hours.
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