# The railroad problem

**URL:** <https://cl.desmos.com/t/the-railroad-problem/3164>\
**Category:** Examples\
**Created:** [April 24, 2021, 1:52pm UTC](https://cl.desmos.com/t/the-railroad-problem/3164 "2021-04-24T13:52:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Aethir](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/aethir/32/2767_2.png) [@Aethir](https://cl.desmos.com/u/Aethir)\
**Post date:** [April 24, 2021, 1:52pm UTC](https://cl.desmos.com/t/the-railroad-problem/3164/1 "2021-04-24T13:52:02Z")

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My colleague’s idea, from her travels. Perhaps a more engaging take on the “train problem” 🙂

> **[Introduction to Systems of Equations • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/608383c6c76592404e0fe913)**
>
> We start introducing systems of equations by introducing a real world "two trains" problem and allowing students to explore