IGCSE Maths / Direct and inverse proportion
Average speed over a multi-stage journey revision notes
Edexcel International GCSE Maths (4MA1), chapter 21: Direct and inverse proportion, specification point 4.4f. Part of the full course.
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Average speed for a whole journey is the total distance divided by the total time. This matters on multi-stage journeys because the stages may take different amounts of time, and stops count towards the total time.