Here’s something I think about when I’m driving, particularly when I’m in a slow 30 miles/hr speed zone: how fast in miles/hr does the fastest sprinter run?
Usain Bolt of Jamaica currently holds the world record for running 100m in 9.58 seconds. In rounded numbers, we have the following calculation
- 100m in 9.58 seconds means
- 1000m = 1km in 95.8 seconds, but
- there are 60*60 = 3600 seconds in an hour, so we have
- (3600/95.8) * 1km in (3600/95.8) * 95.8 seconds = 1 hour, so we have
- 37.6 km in 1 hour, but
- 1 km = .62 miles, so 37.6 km/hr = 23.3 miles/hr
That is, at my 30 miles/hr, I’m still going faster than the fastest human can run, by a non-trivial amount. It still feels slow to me.