Discussion Questions: Predicting Travel Time Using Line Graphs

Why did Harry think that it would take him four hours to get to his grandmother's house? What factors did he not consider in his original analysis?
What values are shown on the x-axis of Harry's graph, and what values are on the y-axis?
What did the line on the graph look like when he was traveling very fast? What happened when Harry started traveling more slowly?
How would you represent Harry's break time (in the card store and ice cream shop) on the graph?
Can you think of something else that changes over time that you could represent using a similar graph?