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
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: