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Each satellite in the Global Positioning System travels at 1.05 x 10^4 km/h. Determine, in kilometres, each satellite’s (a) orbital radius and (b) distance from the surface of Earth.

I did r = (Gm)/v^2 and got 1.37 x 10^8 km for (a), but the answers are supposed to be 4.69 x 10^4 km and 4.05 x 10^4 km for (a) and (b). Could someone pleas explain?

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