Multiple choice

A man completed a certain journey by a car. If he covered 30% of the distance at the speed of 20km/h, 60% of the distance at 40km/h and the remaining distance at 10km/h, his average speed for the whole journey was

  1. 25km/h

  2. 28km/h

  3. 30km/h

  4. 33km/h
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A Correct answer
AI explanation

Assume the total distance is 100 km, meaning he travels 30 km at 20 km/h, 60 km at 40 km/h, and 10 km at 10 km/h. The total time taken for the journey is (30/20) + (60/40) + (10/10) = 1.5 + 1.5 + 1 = 4 hours. The average speed is the total distance divided by the total time, 100 km / 4 h = 25 km/h.

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