Athletic competition
In a 400-meter athletic competition, a participant covers the distance given below. Find the average speed.
first 80 meters 10 m/s
next 240 meters 7.5 m/s
last 80 meters 10 m/s
first 80 meters 10 m/s
next 240 meters 7.5 m/s
last 80 meters 10 m/s
Correct answer:
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