A train travels 60 km at 60 km/h and then 60 km at 120 km/h. What is its average speed?
- 80 km/h
- 72 km/h
- 100 km/h
- None of these
Explanation
Average speed ≠ average of speeds when distances are equal.
Use: Average speed = Total distance / Total time
Total distance = 60 + 60 = 120 km
Time for 1st part = 60 km / 60 km/h = 1 hour
Time for 2nd part = 60 km / 120 km/h = 0.5 hour
Total time = 1 + 0.5 = 1.5 hours
Average speed = 120 / 1.5 = 80 km/h.
Last verified on 13-06-2026
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