Question

there is a park 3 km away from my home on a particular day I went to the park with my brother when we come back my father ask one question each from both of us my answer was 6 but that of my brother was 0 kilometre what do you inform from the description

Answer 1

your answer was about distance. and your brother told about the displacement

Answer 2

Your father asked the total distance you both walked.
You answered correctly i.e 6km
But, your brother thought of displacement and answered 0.

Initial position and final position is same hence displacement = 0
Distance = 3 + 3 = 6km