Before leaving home for the town of Madison, Pete checks a map which shows that Madison is 5 inches from his current location, Gardensquare. Pete arrives in Madison 5 hours later and drove at an average speed of 60 miles per hour. At what scale, in inches per mile, is the map drawn?  Choose the correct choice:
A) 1 / 3
B) 1 / 30
C) 1 / 10
D) 1 / 45
E) 1 / 60

Rationale: "pete covered 5 * 60 = 300 miles which correspond to 5 inches on the map - - > scale in inches per mile is 5 / 300 = 1 / 60 . answer : e ."
Answer: E