Let,12degree45' &12degree15' How To Calculet The Scale Of Map?

Answer 1

assume Let means Lat
45' - 15' = 30 '
30 minutes of latitude is 30 nautical miles
(watch out, does not apply to longitude except at equator)
Also watch out nautical mile is 6076 feet where statute (land) mile is 5280 feet
Conversions here:
https://www.differencebetween.com/difference-between-nautical-mile-and-statute-mile/