Typically as a function of distance traveled by time elapsed. Kilometers per hour, feet per second, etc.
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You need to say the time in which that distance was travelled also to work out speed. Remember, speed is distance/time
If you get the speed of the rock then you can use Time= distance/ speed So all you need is the speed and you can work it out
speed = distance/time therefore: distance = speed x time example: speed = 3m/h time = 6 hours 3 x 6 = 18m = distance travelled
It is the time for light to travel 1mm, subsequently taking the speed of that to work out the speed it takes to travel to the sun in kilometers per hour.
Whether or not if it's an equation because it has no equality sign. but that is wrong it is trying to work out the speed of light.