The mass of the earth is 81% the mass of the moon. The distance between the centres of the earth and the moon is 60 times the radius of earth R = 6400 km. How far is the centre of mass of the earth-moon system away from the earth? %3D A) 4683 km B) 2275 km C) 3592 km D) 5355 km E) 3989 km

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