Three identical spheres,each of mass $1 \ kg$,are arranged as shown in the figure. If their centers of mass are at $P$,$Q$,and $R$ respectively,what is the distance of the center of mass of this system from point $P$?
- A$\frac{PQ + PR + QR}{3}$
- B$\frac{PQ + PR}{3}$
- C$\frac{PQ + QR}{3}$
- D$\frac{PR + QR}{3}$
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