Are motion and position relative or not?

When is an object said to be a particle?

$A$ car moves with a speed of $60 \, km/h$ for $1 \, h$ in the east direction and with the same speed for $30 \, min$ in the south direction. The displacement of the car from the initial position is ......... $km$.

On an open ground,a motorist follows a track that turns to his left by an angle of $60^{\circ}$ after every $500\; m$. Starting from a given turn,specify the displacement of the motorist at the third,sixth and eighth turn. Compare the magnitude of the displacement with the total path length covered by the motorist in each case.

The ratio of displacement to distance for a moving particle is

Your friend driving his car overtakes your car on the highway. Which of the following statements must be true at the instant he is passing you? Assume the cars as point particles.