Answer:
4.5 inches on the map would represent 60 actual feet.
Explanation:
Given that:
1.5 inches on map represents 20 feet in the park.
x be the inches on map that represents 60 feet in the park.
Ratio of distance on map to actual distance :: Ratio of distance on map to actual distance
1.5 : 20 :: x : 60
Product of mean = Product of extreme
20*x = 1.5*60
20x = 90
Dividing both sides by 20

Hence,
4.5 inches on the map would represent 60 actual feet.