Longitudinal Difference between Thimpu (Say T) and Greenwich (Say G)=(90-0)
We know ,
For a longitudinal difference of 1 degree , Time difference is of 4 min.
⇒For a longitudinal difference of 90 degree , Time difference is of 90*4 min.
=360/60 hours=6 hours.=6:00 hours
As T is located to the east , the resultant time difference will be added , (As T is ahead time).
⇒T's local time:(8:15 pm+6:00)
Ans:Thimpu's local time is 2:15 am and it's a day ahead of Greenwich.