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1. It takes Eric 20 minutes to inspect a car. John only needs 18 minutes to inspect a car. If they both start inspecting care at 8:00 am, what is the first time they will finish inspecting a car at the same time?
- A. 9:30 am
- B. 9:30 am
- C. 9:30 am
- D. 9:30 am
Answer: Option C
Explanation:
Least common multiple of 20 & 18 is 180. So, they will finish inspecting a car at the same time after 180 min = 180/60 hr = 3 hr.
Now, 8 am + 3hr = 11 am
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