Answer:
City A and City B are 23.674 miles apart, based on 1:500,000 scale map.
Step-by-step explanation:
One inch in 1:500,000 scale map is 7.891 inches in the real world. Since we have two cities which are 3 inches apart in the map, their real distance is exactly 23.674 miles.
Scale 1:500,000 means that 1 inch in the map is equal to 500,000 inches in the real world.