Aperson jogs eight complete laps around a 400- m track in a total time of 14.0 min . calculate the average velocity, in m/s .

The track has a circumference of 400 m. This is the distance traveled per lap.
Because the person made 8 laps, the total distance traveled is
8 * 400 = 3200 m

The time taken for the  8 laps is 14.0 min = 14*60 = 840 s.

The average velocity  
= distance/time
= (3200 m)/(840 s)
= 3.8095 m/s

3.8 m/s (nearest tenth)