Actually mathematicians done care ( and the physicists in me care less)
for a simple reason for any number greater than 50 you can name I can
give you another one less than yours but still over 50. We can do this
an infinite number of times and still have an infinite number of times
to go. So in pratical terms there is no difference between over 50 and
any number greater than or equal to 50.
Secondly the act of measuring is a physical process which requires some
sort of motion to traverse the trail and according to Heisenburg, there
is a lower bound to how well it can be measured. So to be percise it
should read 50 miles with a standard deviation of X number of miles.
But that's really picking nits ;-).
The acutaly wording is "...not less than 50 miles..."
