Three identical spheres, each of mass \( 1 \mathrm{~kg} \) are kept as shown in figure, touching...

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Three identical spheres, each of mass \( 1 \mathrm{~kg} \) are kept as shown in figure, touching each other, with their centres on a straight line. If their centres are marked \( P, Q, R \) respectively, the distance of centre of mass of the system from \( P \) is
[Kerala PET 2005]
(a) \( \frac{P Q+P R+Q R}{3} \)
(b) \( \frac{P Q+P R}{3} \)
(c) \( \frac{P Q+Q R}{3} \)
(d) \( \frac{P R+Q R}{3} \)
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