# How do you do related rates problems in calculus?

## How do you do related rates problems in calculus?

Let’s use our Problem Solving Strategy to answer the question.

- Draw a picture of the physical situation. See the figure.
- Write an equation that relates the quantities of interest. A.
- Take the derivative with respect to time of both sides of your equation. Remember the chain rule.
- Solve for the quantity you’re after.

**Are related rates on the AP exam?**

Related Rate problems appear occasionally on the AP calculus exams. Typically there will be a straightforward question in the multiple‐choice section; on the free‐response section a related rate question will be part of a longer question or, occasionally, an entire free-response question.

### What are related rates in calculus?

In differential calculus, related rates problems involve finding a rate at which a quantity changes by relating that quantity to other quantities whose rates of change are known. The rate of change is usually with respect to time.

**What makes a problem a related rates problem?**

A “related rates” problem is a problem in which we know one of the rates of change at a given instant—say, ˙x=dx/dt—and we want to find the other rate ˙y=dy/dt at that instant.

## Is related rates on AP calculus?

Rates are usually (for AP Calculus) in relation to time. Therefore, we differentiate both sides with respect to time.

**How many liters of gasoline have been used by the car when it reaches a speed of 80 kilometers per hour?**

0.537 liters

Indicate units of measure. (c) How many liters of gasoline have been used by the car when it reaches a speed of 80 kilometers per hour? 1:answer Then, r(T) = 80 or T = 0.331453 hours. and has consumed g(x(T)) = 0.537 liters of gasoline.

### How do related rates work?

Related Rates are Calculus problems that involve finding a rate at which a quantity changes by relating to other known values whose rates of change are known. For instance, if we pump air into a donut floater, both the radius and the balloon volume increase, and their growth rates are related.

**What is a related rate problem?**

Related rate problems involve functions where a relationship exists between two or more derivatives. For example, you might want to find out the rate that the distance is increasing between two airplanes. Solving related rate problems has many real life applications.

## What are some real life examples of rates problems?

Let’s work another problem that uses some different ideas and shows some of the different kinds of things that can show up in related rates problems. Example 4 A tank of water in the shape of a cone is leaking water at a constant rate of 2ft3/hour 2 ft 3 / h o u r. The base radius of the tank is 5 ft and the height of the tank is 14 ft.

**What is an example of calculus in everyday life?**

For example, a gas tank company might want to know the rate at which a tank is filling up, or an environmentalist might be concerned with the rate at which a certain marshland is flooding. Solving the problems usually involves knowledge of geometry and algebra in addition to calculus.