Distance Speed Time Calculator
OK, I know this is physics and not pure math, but it's free and it might show handy. :)
This calculator basically does something very simple  it calculates distance, speed (velocity) or time if you have the other two. If you want to know a little more about this  scroll below the calculator.
Time from Distance and Speed
Distance from Speed and Time
Speed from Distance and TimeFree JavaScripts provided by The JavaScript Source
It all starts with this formula: That's the formula when we have time and distance and want to know the speed (velocity).
If we have speed and time, and want to know the distance: Distance = Speed × Time
And finally, if we have speed and distance, and want to calculate the time:
