Watch the video to listen to Steph, a sports coach, describe how calculating speed, distance and time is useful when coaching and playing football.

You want to know how much time it takes to travel a certain distance (the distance to the sun) given a speed of 100 mph. So, what we want to calculate is "t." ...

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.

If the speed of light is low enough, this still won't work. Now I have a new distance that the light will travel making it take more (or less) time.

What is speed? Definition. Units of speed. Calculate one of distance, speed or time given the other two variables.