what is the time and day at a certain place on 60 degree west longitude when it is 5:30 AM on Friday at a place 90 degree ast longitude

http://maps.unomaha.edu/Peterson/geog1000/Notes/Notes_Exam1/Time_Zones.html

To determine the time and day at a certain place given the time and day at another place, we need to consider the concept of time zones and the rotation of the Earth.

First, let's calculate the time difference between the two longitudes. Since there are 360 degrees in a complete rotation of the Earth and each day consists of 24 hours, we can determine that there is a time difference of 24 hours for every 360 degrees of longitude.

Given that the time at a place with a longitude of 90 degrees east is 5:30 AM on Friday, we can calculate the time difference by subtracting 90 from 180 (360/2). This gives us a difference of 90 degrees or 6 hours (24/4).

Now, let's determine the time and day at the place with a longitude of 60 degrees west when it is 5:30 AM on Friday at the place with a longitude of 90 degrees east.

Since the time difference is 6 hours, we need to subtract 6 hours from 5:30 AM. This gives us a time of 11:30 PM on Thursday.

Additionally, as the Earth rotates from east to west, the time also moves in that direction. Therefore, when it is 11:30 PM on Thursday at a place with a longitude of 60 degrees west, it will be a different day.

Considering this, if it is 11:30 PM on Thursday at a place with a longitude of 60 degrees west, the day would already be Friday at that location.