Civil Service Exam Reviewer · Word Problems · hard
Sofia leaves a town driving at 30 km/h. 1 hour(s) later, Ella leaves the same town on the same road at 50 km/h. How long after Ella starts will Ella catch up?
- 2 hours and 30 minutes
- 1 hour and 30 minutes
- 36 minutes
- 2 hours
Answer
B. 1 hour and 30 minutes
Solution
Head start = 30 × 1 = 30 km. Gap closes at 50 − 30 = 20 km/h. Time = 30 ÷ 20 = 1 hour and 30 minutes.
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