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A train travels 60 km at 60 km/h and then 60 km at 120 km/h. What is its average speed?
  1. 80 km/h
  2. 72 km/h
  3. 100 km/h
  4. 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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