It is so because velocity and speed differ each other by direction. In a 100 m sprint race ,the person moves in a straight path without changing its direction where as in a 400 m race , the person moves in a lap around the race track and the direction changes as he turns according to the race track.

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Explanation:

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In the run of 100 m, its length of the displacement is 100 meters. For both the 100-m run, which implies, that speed and speed were equivalents. The distance throughout the 400-m run is 400-m, however, the riders end at the very same place, so the displacement is zero. Zero changes imply zero speed.

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