Answer:
The two buildings would be 9/16 inches apart on the map 
Explanation:
Here, we want to get the distance between the two buildings 
Let the us be x
From the question;
3/4 in = 80 miles 
x in = 60 miles 
x * 80 = 60 * 3/4
80x = 45
x = 45/80 = 9/16 in