Footrace is 1000 meters long.

Speed = Distance / Time.

1st Contestant runs 6 mph for all 1000 meters, takes 10 minutes.

2nd Contestant runs 12 mph for first 500 meters, takes 2.5 minutes. Runs 3 mph for second 500 meters, takes 10 minutes. Total time: 12.5 minutes.

1st Contestant wins with a total time of 10 minutes, compared to 12.5 minutes for 2nd Contestant.
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