Civil Service Exam Reviewer · Word Problems · medium
Ivan can paint a room in 6 hours, while Liza can paint it in 9 hours. How long will it take them working together?
- 7 hours and 30 minutes
- 15 hours
- 3 hours and 36 minutes
- 4 hours and 36 minutes
Answer
C. 3 hours and 36 minutes
Solution
Combined rate = 1/6 + 1/9 = 5/18 room/hour. Time = 3.6 hours = 3 hours and 36 minutes.
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