Multiple choice

A car covers 30 km in 30 minutes and the next 30 km in 40 minutes. Calculate the average speed for the entire journey.

  1. 51.4 km/hr

  2. 60.5 km/hr

  3. 77.3 km/hr

  4. 85.6 km/hr
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A Correct answer
Explanation

Average speed is total distance divided by total time. Total distance is 30 + 30 = 60 km. Total time is 30 + 40 = 70 minutes, which is 70/60 = 7/6 hours. Average speed = 60 / (7/6) = 360/7 = 51.428 km/hr.

AI explanation

Average speed is calculated as the total distance travelled divided by the total time taken. The total distance for the journey is 30 km plus 30 km, which equals 60 km, and the total time is 30 minutes plus 40 minutes, which equals 70 minutes or 7/6 hours. Dividing 60 km by 7/6 hours gives an average speed of approximately 51.4 km/hr.

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