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How Far Away Is The International Space Station From The Center Of The Earth? - Math Discussion

How far away is the International Space Station from the center of the Earth?

The moon takes 27.32 days to revolve around the Earth once. The moon is 4.1 x 107 from the center of the Earth. If the International Space Station makes an orbit around the Earth in 90 minutes, then how far away is the International Space Station from the center of the Earth?