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?

Answer 1

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.