This one is pretty easy. All you need to do is to find some cliffs
and some rocks.
The first cliff needs to be 176.4 meters high and in a vacuum
(neglect for variables like air, etc.) Assuming 9.8meters per
second per second, the time it takes a stone to freefall to the
bottom (in seconds) will give you 'A'.
Then find a cliff that takes the stone 5.23 seconds to reach the
bottom. The height of this second cliff gives you 'B'. (round to a
whole number) That's it!
***EDIT 6/2 - Thanks to Catara for finding my error - I've changed
the numbers in the problems - I forgot a critical part of the
equation!
The cache is at
N 40° 58.4A5 W111° 26.B
It's under the stone, of course.
Don't give away the ending, it's
the only one we have.
Not very confident of your answer? Go ahead and
check it.