Athletic competition

In a 400 meter athletic competition, a participant covers the distance as 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

Result

v =  8.333 m/s

Solution:

Solution in text v =
Solution in text v = : Nr. 1

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