Math 8th Grade Please help

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

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asked by Chris
  1. shuttle from center = 6371+315 = 6686 km

    circumference = 2 pi r = 42,009 km

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

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    posted by Damon

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