### Home > PC3 > Chapter 2 > Lesson 2.1.2 > Problem2-28

2-28.

​Kyla and Sergio are in a race to see who can eat an ice cream cone the fastest. Kyla is confident that she will win, so she gives Sergio a five-second head start. If $t=$ elapsed time in seconds since Sergio started eating his ice cream, write an expression, using $t$, for the amount of time elapsed since Kyla started eating her ice cream. Then sketch a possible time vs. amount of ice cream eaten graph.

When Sergio $=5$ seconds, Kyla $=0$ seconds.
When Sergio $=7$ seconds, Kyla $=2$ seconds.
Write an expression relating how these times are related.