The farthest a place can be east or west of the prime meridian is how many degrees of longitude 45, 90, 180 or 360?

Prime Meridian is a sub-part of the meridian. Meridian is a line that traverses north and south on the globe and converges on the north and south poles of the globe. Prime Meridian is the line that passes through the centre of the globe and divides the globe equidistantly. That line makes an angle which is called the longitude.