usage of horse 'speedometer' which should be accurate to within 0.01%
1. locate the start, which is near the tall cone in desertopia
2. you may want to make sure the chest at the end of the track is empty and that the hopper is full
3. run through the pressure pads and keep going all the way to the end of the road. when you reach the end, turn left and place the horse somewhere where it won't activate the pressure pads accidentally
4. count the items inside the chest, add 2 to that amount, and divide by 2.5. this is the amount of seconds
5. the track is 90 meters long. you can figure out m/s with this
6. place items in chest back into hopper
7. no need to reset the redstone
start:
end: