Question

Calculate the location of a place where the local time is noon when it is 7:30 p.m at Greenwich.

Answer 1

Time at Greenwich = 7:30 pm
Greenwich is the 0° meridian of longitude.

Time at given place = 12 pm

Difference between the time at both places = 7 hours 30 mins.

NOW, as the time at given place is LESS than that at the Greenwich meridian, the place is to the WEST of it.

CALCULATION:
1° = interval of 4 mins
Therefore, 15° = 1 hour
Now, X° = 7.5 hours
-> 15 × 7.5 = 7.5 hours
-> 112.5° WEST

Answer 2

Answer:

Check out the attachment

Hope it helps.