Compound measures
Lesson 7 of 9
Speed, distance and time
Objective. Calculate speed, distance or time from the other two.
The key idea
Speed = distance ÷ time. Rearranged: distance = speed × time and time = distance ÷ speed. Units must match — km with hours gives km/h.
Worked example
A car travels 150 km in 2 hours 30 minutes. Find the speed.
- 12 h 30 min = 2.5 hours.
- 2150 ÷ 2.5 = 60.
Answer: 60 km/h
Practice
Each question comes with a picture and a listen button. Try it first, then reveal the answer.
Common mistake. Writing 2 hours 30 minutes as 2.3 hours.
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