v = dx/dt

If you are driving 5 miles across town (dx), and you average 25 mph (v), it will take you roughly 5/25 hours, or 12 minutes (dt) to get there. By driving 50 miles per hour, you get there in 6 minutes. Is it worth the risk to yourself and others (bikers and pedestrians) to save 6 minutes?

If you are driving to work and it normally takes you 30 minutes to get there by going 60 mph (30 miles), then if you go 80 mph by frequently changing lanes and tailgating the guy in front of you you will save around 8 minutes getting to work.

dt = 30/60 = 30 min dt = 30/80 = 22.5 min

Is it worth the risk to yourself and others to save 8 minutes?

Drive safely with the appreciation of v = dx/dt!