The scale of the map is missing. the actual distance from liberty to west quall is 72 miles, and it is 6 inches on the map

72 miles ... 6 inches
x miles = ? ... 1 inch

If you would like to know the scale of the map, you can calculate this using the following steps:

72 * 1 = 6 * x
72 = 6 * x     /6
x = 72 / 6
x = 12 miles

Result: 12 miles represent 1 inch on the map.