Multiple choice

A car travels a distance of 75 km at the speed of 25 km/h. It covers the next 25 km of its journey at the speed of 5 km/h and the last 50 km of its journey at the speed of 25 km/h.What is the average speed of car?

  1. 15 km/h

  2. 12.5 km /h

  3. 40 km/h

  4. 25 km/h
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A Correct answer
Explanation

Total distance = 75 + 25 + 50 = 150 km. Total time = (75/25) + (25/5) + (50/25) = 3 + 5 + 2 = 10 hours. Average speed = 150 / 10 = 15 km/h.

AI explanation

Average speed is total distance divided by total time. The total distance is 75 km + 25 km + 50 km = 150 km. The times for each segment are 75/25 = 3 hours, 25/5 = 5 hours, and 50/25 = 2 hours, making the total time 10 hours. Dividing 150 km by 10 hours gives an average speed of 15 km/h.

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