Question

find out the time at 40E longitude when the time at 20W longitude is 2:00 pm

Answer 1

You cannot calculate times based on longitude. You have to look up the legal time zones in specific locations and use the difference between the time zones at those locations to figure out the time.

There are two different time zones that include 40E and two different time zones that include 85W, and at 85W it might or might not be Daylight Savings Time, depending on the time of year. The time difference between these longitudes might be 7, 8, 9, or 10 hours.