Question

a runner runs around a 400 m track three times and ends up where she started. what distance has she run? what is her displacement?

Explanation:

Step1: Calculate the distance

Distance is the total length of the path covered. The track is 400 m and she runs 3 times.
$$400\times3 = 1200$$

Step2: Determine the displacement

Displacement is the straight - line distance from the initial to the final position. She ends where she started.
$$0$$

Answer:

Distance: 1200 m; Displacement: 0 m