Two particle, P and Q are initially at two ends of a circular arc which subtends an angle of 120 at the arc-center. The radius of the arc is r. The particle P and Q are moving along the arc towards each other with constant tangential velocities of Vp and Vo respectively. The distance travelled by the particle P when it meets the particle Q is 2r(V + V) 2 I(V + V) P P 3 Vp 3 Vo (a) (c) 2 rV 3 (V + V) (b) rV 2 (d) (0) 3 (V 3 (V +V) -V)