Imagine a brother and sister biking from their home to a nearby park. The brother starts off very quickly, but then gets tired and slows down. The sister bikes at the same speed the entire time. They arrive at the park at the same time.

A road map could show you the route and the distance that they traveled. But a distance–time graph can give you information about who was ahead and who was biking faster as they rode. In this lesson, you will learn how to read and interpret a distance–time graph.