So it says the map shows 3 inches between the two cities. The actual distance is 240 miles. There are 63, 360 inches in a mile, so that means 1 mi = 63, 360 in. You need 3 inches, so you would multiply 63, 360 by 3. This would give you 190, 080 in. You would put the ratio together as inches on the map to inches in real distance. Your ratio should be
3 in : 190, 080 in.
