477
xkcd #2888: US Survey Foot
(imgs.xkcd.com)
Alt text:
Subway refuses to answer my questions about whether it's an International Footlong or a US Survey Footlong. A milligram of sandwich is at stake!
As long as the person fleeing is the one using the survey feet, the pursuers will never actually reach them.
Ah yes. Zeno's left foot.