Do you know, how fast the Earth is moving through the space?
How fast the Earth is rotating around herself?
And do you know, how fast the Earth is orbiting the sun?
Check it out with this App.
Count the kilometres from point A to point B
This App includes the mathematical formulas, to calculate the speed for yourself if you want.
You can also use your GPS coordinates.
Your location wont be used for anything else than the calculation for the speed of the earth rotation at your specific place on earth.
:-) Have fun