Civil Service Exam Reviewer · Word Problems · medium
A car travels 40 km from Manila to a province at 40 km/h and returns at 120 km/h. What is the average speed for the round trip?
- 80 km/h
- 160 km/h
- 62 km/h
- 60 km/h
Answer
D. 60 km/h
Solution
Time = 40/40 + 40/120 = 1.333 h for 80 km. Average = 80 ÷ 1.333 = 60 km/h (not the simple average).
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