Figuring out how far away something is and how long it will take to get there involves understanding speed, acceleration, and distance. Readers get an introduction to these concepts and learn about the units of measure involved.

What is motion? -- What is speed? -- What units are used when measuring speed? -- How fast is fast? -- What is acceleration? -- What units are used when measuring acceleration? -- Which horse goes the fastest? -- Answers to "You do the math.".