Civil Service Exam Reviewer · Word Problems · hard
Mila leaves a town driving at 50 km/h. 3 hour(s) later, Liza leaves the same town on the same road at 70 km/h. How long after Liza starts will Liza catch up?
- 10 hours and 30 minutes
- 2 hours and 9 minutes
- 7 hours and 30 minutes
- 6 hours
Answer
C. 7 hours and 30 minutes
Solution
Head start = 50 × 3 = 150 km. Gap closes at 70 − 50 = 20 km/h. Time = 150 ÷ 20 = 7 hours and 30 minutes.
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