Multiple choice

A truck covers 40 km with an average speed of 80 km/h. Then it travel another 40 km with an average speed of 40 km/h. The average speed of the truck for the total distance covered is approximately:

  1. 40 km/h

  2. 45 km/h

  3. 48 km/h

  4. 53 km/h
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D Correct answer
Explanation

Average speed is total distance divided by total time. Total distance is 40 + 40 = 80 km. Time for first part is 40/80 = 0.5 hours, and time for second part is 40/40 = 1 hour. Total time is 1.5 hours, so average speed is 80/1.5 = 53.33 km/h.

AI explanation

Use the average speed formula for equal distances, which is twice the product of the speeds divided by their sum. The calculation is 2 multiplied by 80 multiplied by 40, divided by the sum of 80 and 40. This gives 6400 divided by 120, resulting in an average speed of approximately 53.33 km/h.

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