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According to the question, the time at 90 degree East longitude is 11 am, and to reach 15 degree west longitude it will have to go 105 degrees east as first of all it will go to 0 degree and then 15 degree to reach 15 degree west longitude. visit our page: bharrathividyashram .org/about-us
Greenwich England
The prime meridian is the longitude (vertical) line that measures 0 degrees.
The greatest number of degrees anyone can be from the prime meridian is 180 degrees. This is because the prime meridian itself is located at 0 degrees longitude, and the maximum longitude value is 180 degrees both east and west. Therefore, any location can be a maximum of 180 degrees away from the prime meridian.
It is the "Prime Meridian" or the "0 degree Meridian" which is the basis for calculating time in most of the world.