Examples A bar model can represent speed, distance and time. An object moves at a speed of 20 kilometres per hour (km/h) for 6 hours. How far does it travel?

Speed is a compound measure of how fast an object moves. It is given as a distance per unit of time. Distances are units of length and can be given in metric units close metric unitsUnit of ...

For example, if you know the speed of any vehicle and the distance covered by that vehicle, then you can easily calculate the time taken for the entire journey by using the above formula.

But using speed to calculate distance leaves no way to calculate any “peculiar motion” the galaxy might have in addition to the motion that is part of the overall expansion.