Civil Service Exam Reviewer · Word Problems · medium
Ivan can paint a room in 5 hours, while Sofia can paint it in 20 hours. How long will it take them working together?
- 12 hours and 30 minutes
- 4 hours
- 8 hours and 20 minutes
- 5 hours
Answer
B. 4 hours
Solution
Combined rate = 1/5 + 1/20 = 1/4 room/hour. Time = 4 hours.
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