The masses of the Earth and Moon are 5.98 x 1024 kg and 7.35 x 1022 kg,

Question:

The masses of the Earth and Moon are 5.98 x 1024 kg and 7.35 x 1022 kg, respectively, and their centers are separated by 3.84 x 108 m.
(a) Where is the CM of this system located?
(b) What can you say about the motion of the Earth-Moon system about the Sun, and of the Earth and Moon separately about the Sun?