Author note — to cover

Read speed as gradient and rest as horizontal sections on journey graphs including the return leg; calculate speeds with mixed units, find average speed for a whole journey, and correct the graph-as-picture-of-the-road misconception. Curved graphs and tangent gradients are the Higher gradients-and-areas group. Both tiers. (A14)

• Fluency — direct questions on distance–time graphs, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).