# Calculate Average Speed

In this worksheet, students will work out simple average speeds without a calculator

Key stage:  KS 3

Curriculum topic:   Ratio, Proportion and Rates of Change

Curriculum subtopic:   Solve Problems Involving Compound Units

Difficulty level:

#### Worksheet Overview

Speed is an example of a compound measure because it involves more than one unit of measure.

Speed is a measure of distance in relation to time

For example, a common one is the speed of a car. It is measured in mph or miles per hour or km/h kilometres per hour.

We can work this out in the first instance without a calculator if we look at average speed!

Let's say we set out in a car from home.

We travel at a constant speed, and after 1 hour we are 50 miles away from home.

We can say that our speed was 50 mph because it means 50 miles per 1 hour.

It does what it says on the tin!

30 mph means we can travel 30 miles in 1 hour.

Let's try a question.

Example

What is the average speed of a car which travels 80 miles in 2 hours?

If the car travels 80 miles in 2 hours, we want to know how far it has travelled in 1 hour for the average speed.

80 ÷ 2 = 40 miles in 1 hour

Therefore, the average speed is 40 mph.

Let's have a go at some questions!

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