Question

Manaus city in Brazil is located on 60 degree W longitude. What would be the local time at Manaus when it is 12noon at Greenwich

Answer 1

8 a.m. would be the local time at Manuas

Answer 2

According to the GMT (Greenwich Mean Time) theory,any longitudinal point on the earth has a specific time zone compared with the Greenwich's time zone.Every 1° of longitudinal distance occurs 4 minutes of time difference with the Greenwich.

(4 minutes after for East longitudes and 4 minutes before for West longitudes.)

According to this GMT theory the Manaus City(60° W) of the Brazil has a longitudinal distance of 60° or 240 minutes time difference.

240 minutes =4 hours.

So,when the local time of the Greenwich is 12p.m .The local time of the Manaus city will be 8.a.m at that moment.