$A$ force separately produces accelerations of $18 \ m/s^2$,$9 \ m/s^2$,and $6 \ m/s^2$ in three bodies of masses $P$,$Q$,and $R$ respectively. If the same force is applied on a body of mass $P+Q+R$,then the acceleration of that body is: (in $m/s^2$)
- A$3$
- B$6$
- C$2$
- D$33$
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