Marseilles and Algiers lie on the same longitudinal line. Algiers is at 37 degrees latitude and Marseilles is at 47 degrees latitude. If the earth is a sphere of radius 4000 miles, use arc length to find the distance between the cities. [Use pi = 3.14, and round to the nearest mile.]
A) 620 miles
B) 680 miles
C) 730 miles
D) 760 miles