Remember, a bar scale shows graphically the ratio of map units to ground units. The top scale shows the comparable ground measurement in kilometers (km) and the bottom bar scale shows the comparable length in miles (mi). What is the RF for each of them. Hint: use your ruler. 0 75 F 0 25 50 150 100 150 300 Kilometers 200 Miles What is the RF for the top scale (km)? Measure in cm from 0 to 150 on the scale