posted by karina .
assuming that Earth is a sphere of a radius 6378 kilometers, what is the difference in the latitudes of Lynchbug, Virginia, and Myrtle Beach, South Carolina, where Lynchbug is 400 kilometers due north of Myrtle Beach?
90 degrees of latitude is 1/4 of the earth's circumference, or 10,018 km
That makes 111.3 km per degree
400 km is thus 400/111.3 = 3.59 degrees of latitude.