, describe a trip that has a (scalar) distance of 400 meters but the magnitude of the resultant displacement vector is 0 meters.

Answer 1

The 400 metres, or 400-meter dash, is a sprint event in track and field competitions. It has been featured in the athletics programme at the Summer Olympics since 1896 for men and since 1964 for women. On a standard outdoor running track, it is one lap around the track. Runners start in staggered positions and race in separate lanes for the entire course.

--Wikipedia

Answer 2

200 meters out in any direction and 200 meters in the opposite direction (180° from initial direction)

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