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 of radius 4000 miles, use arc length to find the distance between the cities. [Use π = 3.14, and round to the nearest mile.] A) 4880 miles B) 5160 miles C) 5410 miles D) 5650 miles