Civil Service Exam Reviewer · Word Problems · medium
Rina can paint a room in 10 hours, while Bea can paint it in 40 hours. How long will it take them working together?
- 25 hours
- 8 hours
- 16 hours and 40 minutes
- 9 hours
Answer
B. 8 hours
Solution
Combined rate = 1/10 + 1/40 = 1/8 room/hour. Time = 8 hours.
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