The starting point for the particle is origin as shown in figure.The Distance traveled by the particle is:\\\\(D =20+20+20\\\\)\\\\(=60 m\\\\)The displacement is the distance between the initial and the final points.Displacement \\\\(\\Rightarrow OB=20 m\\\\) in the negative directionThe distance is \\\\(60\\ m\\\\) and displacement is \\\\(20\\ m\\\\) in negative direction.