The radius of Earth is 6,371 kilometers. A space shuttle orbits 315 kilometers above the surface of Earth. The space shuttle completes 240° of a revolution around Earth in one hour. What is the average speed of the space shuttle? Choose the closest answer.

Question

Please help both with solving and answering.
(a) 14,000km/hr (b) 20,100km/hr (c)28,000km/hr (d) 63,000km/hr

Answer 1

shuttle from center = 6371+315 = 6686 km

circumference = 2 pi r = 42,009 km

went 240/360 of circumference = 28,006 km/hr