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W=k/d^2. Distance = r+R. Distance from the centre, r=0 W=k/R×R K =W×R×R W=w×R×R/(r+R)^2 4W/9=(W×R×R)/(r+R)^2 4W(r+R)^2= 9×W×R×R 4(r+R)^2=9×R×R (r+6400)^2= 9×6400×6400/4 r+6400= 9600 r = 9600-6400 r=3200km
