You find that out by looking at the map's scale bar.
To find how far an inch is on a map, look for the map scale. It will indicate how many miles is in an inch.
If 1 inch on a map equals 5 miles, then 150 miles is 30 inches.
10 miles = 1/4 inch
(500x2)/3 = 333.3333... miles
1 inch represents 750 miles. A half inch represents 375 miles.
You answered it yourself. If 1 inch= 750 miles, then 1 inch= 750 miles.
You would have to refer to the scale markings or legend on the map to determine that. Different maps have different scales.
the scale
The map where 1 inch equals 100 miles
In many cases it indicates how many miles in one inch.
That depends on the scale factor which should be shown on the map
It all depends on the map, look around the map for a scale.