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

Correct result:

v =  8.3333 m/s


s=vt s1=80 m s2=240 m s3=80 m  v1=10 m/s v2=7.5 m/s v3=10 m/s  t1=s1/v1=80/10=8 s t2=s2/v2=240/7.5=32 s t3=s3/v3=80/10=8 s  v=s1+s2+s3t1+t2+t3=80+240+808+32+8=253=8.3333 m/s

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