Complete Noob Needs help

[Spiderpig1021]

I searched but didn't see what I needed. Forgive me if this is on another stream.
I have video of a car going down a road at an unknown speed. I recorded 5 videos of vehicles at known speeds on the same section:
1) How do I take the original and 2 other videos, line them up so I can compare speeds?
2) What programs will do this? Easiest to use? Cheapest?
Thanks

[raffriff42]

Load each video in VirtualDub (or any video program that lets you step frame-by-frame)
Count the video frames as each car passes two fixed points.
Elapsed time = (frame count) / (frames-per-second)
The rest is simple math.
(this only works if your camera is stationary)

[videobruger]

First use MediaInfo (View -> Text) and export the result (Alt+E, Text) and attach to a post to tell if constant or variable framerate is used.