A particle moves along x -axis. Particle moves from 0 to $C$ in 12 s and then immediately returns to

Question

A particle moves along x -axis. Particle moves from 0 to $C$ in 12 s and then immediately returns to B in 3 s . Its average speed is

Professor PC Thomas Classes · Answer

Given answer C ($30 \mathrm{m/s}$),  total distance is $450\mathrm{m}$. $450/15=30$.