What is the approximately land distance in miles if the map distance is and the map scale is ?

The map scale formula is:

Known values:

Written as:

The map scale is changed to fraction as shown here:

Rewrite the equation used for to find the Earth (Land) Distance:

Convert inches to miles (use calculator):

(Answer)

Reference:

http://egsc.usgs.gov/isb/pubs/factsheets/fs01502.html

http://www.physicalgeography.net/fundamentals/2a.html

http://en.wikipedia.org/wiki/Map_scale