# Maths: Algebra 1 - Travel Graphs

- Created by: emilie
- Created on: 25-05-11 15:18

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### Speed, Distance and Time

The following is a basic but important formula which applies when speed is constant (in other words the speed doesn't change):

Remember, when using any formula, the units must all be consistent. For example speed could be measured in m/s, distance in metres and time in seconds.

If speed does change, the average (mean) speed can be calculated:

Average speed = total distance travelled

total time taken

### Units

In calculations, units must be consistent, so if the units in the question…

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