$\text{average speed}=\frac{\text{total distance travelled}}{\text{total time taken}}$average speed=total distance travelledtotal time taken
$S=\frac{D}{T}$S=DT
Unknown time | Unknown distance |
---|---|
$T=\frac{D}{S}$T=DS | $D=S\times T$D=S×T |
To create maps, building plans, and other technical drawings, the features being represented must be scaled down to fit on the piece of paper, and we express this scaling factor with a ratio. For example, if a small city is $100000$100000 times larger than a piece of paper, scaling its features down onto a map drawn on that paper would have the scaling ratio of $1:100000$1:100000, meaning $1$1 cm measured on the map represents $100000$100000 cm (or $1$1km) in real life.
Another way to represent the distances on a map or building plan is to use a scale bar. This small bar on the drawing shows the corresponding distance in real life. On a map, a scale bar might measure $10$10 cm long, but if it is labelled as $20$20 km we know that if two features are $10$10 cm apart on the map then they are $20$20 km apart in real life.
Ned took a plane from Brisbane to Townsville. The flight time was $2.4$2.4 hours. If the distance between Brisbane and Townsville is $5.8$5.8 units as it appears on the map, what is the average speed of the airplane?
Evaluate the answer to two decimal places.