Civil Service Exam Reviewer · Word Problems · medium
A car travels 100 km from Manila to a province at 45 km/h and returns at 90 km/h. What is the average speed for the round trip?
- 67.5 km/h
- 135 km/h
- 62 km/h
- 60 km/h
Answer
D. 60 km/h
Solution
Time = 100/45 + 100/90 = 3.333 h for 200 km. Average = 200 ÷ 3.333 = 60 km/h (not the simple average).
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