In Belgian traffic, 100km takes 100 years to drive, so they're both right :p

I'll side with the American: pretty much anyone can go 100km, and pretty much no one can go 100 years.

As a european, I can go more than 100km, but I very rarely do go anywhere near that far - our towns are based on the assumption of walking rather than the assumption of driving, so anything more than a 15 minute walk away is "exotic"; on the other hand, the architecture I walk past between my home and the office is just about to celebrate its 1000th birthday :)