Quick answer: Average speed equals total distance divided by total time. For constant speed, distance = speed × time and time = distance/speed. Convert units before calculating.
Worked example
A car travels 150 km in 2.5 hours. Find its average speed in km/h and m/s.
- Average speed = 150/2.5 = 60 km/h.
- Convert using 1 km/h = 5/18 m/s.
- 60×5/18 = 50/3 m/s, approximately 16.67 m/s.
Check the result
Travelling at 60 km/h for 2.5 hours covers 60×2.5 = 150 km.
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Common mistake to avoid
Average speed is not usually the arithmetic mean of two speeds. Use the total travel time, including stated stops. Speed and velocity are different quantities.
Try it yourself
1. How far does 12 m/s cover in 30 s? 2. How long does 90 km take at 45 km/h?
Answers and reasoning
1. 12×30 = 360 m. 2. 90/45 = 2 h.
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