The cities of Singapore (in Asia) and Kigali (in Africa) both lie approximately on the equator. Singapore is at 104° longitude, and Kigali is at 30° longitude. If the Earth is a sphere with a radius of 4000 miles, use arc length to find the distance between the cities. (Use [tex]\pi = 3.14[/tex], and round to the nearest mile.)

A) 4880 miles
B) 5160 miles
C) 5410 miles
D) 5650 miles