The speed of an object is a measure of how fast it is moving.
(Velocity is the same value as the speed but also includes the object's direction.)
Speed tells us how far (the distance) the object moves in a certain time.
Because speed changes often over a journey, we usually mean AVERAGE speed.
If the distance is measured in kilometres and the time in hours the speed will be given in km/hr (kilometres per hour)
The formulas used to calculate the speed, distance and time are:
This means 
Example A car travels from Christchurch to Dunedin a distance of 360 km. Speed = Distance ÷ Time = 360 ÷ 4 =90 km/h 

This means 
Example A plane flies from Auckland to Invercargill a distance of about 1600 km. Time taken = Distance ÷ Speed = 1600 ÷ 400 = 4 hours 

200 metres
