Speed
Measurement of speed is a rate many people use daily when driving their car. Speed is the ratio between distance and time.
In Australia and many other countries the standard is kilometres per hour (km/h).
To calculate speed, we can use the formula: $\text{Speed}=\frac{\text{Distance}}{\text{Time}}$Speed=DistanceTime
To find time we use: $\text{Time}=\frac{\text{Distance}}{\text{Speed}}$Time=DistanceSpeed
Or to calculate distance we use: $\text{Distance}=\text{Speed}\times\text{Time}$Distance=Speed×Time
Practice questions
Question 1
A dog travels $42$42 km in $1.4$1.4 hours.
At what speed is it travelling?
Question 2
What is the time required for a car to travel $170$170 kilometres at a speed of $10$10 kilometres per hour?
Question 3
What is the distance travelled by a car if it travels at $60$60 kilometres per hour for $9$9 hours?
Question 4
Homer is driving $700$700 kilometres to visit their family. The car has a fuel economy of $5$5 L/$100$100 km. How many litres of fuel will Homer require to make this trip?