Bad Man poses two word problems to Ashley and Celia. Given a start and an end time, they need to calculate the duration of a train ride and the length of a video recording.
Digit and Matt make stew for a cooking competition, and Digit explains how he will use a timer to cook it for 5 minutes. When Buzz steals the timer, Digit panics, but Matt explains how they can use a clock to cook the stew for the correct amount of time.
When an important package is passed on to Homer, he delivers it to Mr. Burns, the sender of the package. Mr. Burns then releases a disappointing booby trap; he is not well-versed in the metric system.
Bill introduces the ancestor of the modern clock: the sundial. He illustrates how it uses shadows to indicate the time of day and explains how it influenced the clock. A time lapse then shows how the sundial and clock are in sync as the hours go by during the day.