How to find out the travel distance and speed? 1. Set the [color=#1551b5]height of the plane[/color] 2. Set the [color=#0a971e]height of the ruler[/color] 3. Drag point to the plane position you filmed 2 seconds after it was above you. 4. [b]d_plane[/b] gives you the travel distance. 5. Look up the time between the two positions and you can calculate the plane's speed.