### Overview

The derivative tells us how a change in one variable affects another variable. Related rates problems ask how two different derivatives are related. For example, if we know how fast water is being pumped into a tank we can calculate how fast the water level in the tank is rising. The chain rule is the key to solving such problems.

### Lecture Video and Notes

#### Video Excerpts

Clip 1: Introduction to Related Rates

### Recitation Video

#### Inflating a Balloon

#### Sliding Ladder

### Worked Example

Solving an Optimization Problem Using Implicit Differentiation