A car travels 60 km at 30 km/h and then 60 km at 60 km/h. What is its average speed for the whole trip?

Answer and explanation

Correct answer: C. 40 km/h

  1. Step 1: Time = 60/30 + 60/60 = 3 h.
  2. Step 2: Average speed = 120/3 = 40 km/h.
Answer
40 km/h.
Why not the others: 45 km/h, 60 km/h and 48 km/h do not fit.

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