What is the driving distance in miles between Salt Lake City and Ogden?

Source: United States Geological Survey

To find the distance, we use the miles scale on the map as shown here:

Then mark the map as shown here:

Based on the distance of the green line between Salt Lake City and Ogden, the driving distance is approximately

(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