Aperson jogs eight complete laps around a quarter mile track in a total time of 12.5 min . calculate the average speed and the average velocity in m/s

8 laps time 1/4 mile is 2 miles 

Average speed in miles per hour: 
2 mi / 12.5 min * 60 min/hour = 9.6 mph 

Average velocity is zero, since velocity is directional and the person jogged around a track. [I mention that in case this was set up as a trick question.] 

But if we're really looking for average SPEED in m/s we can easily convert: 
A mile is about 1.6 km, so it's about 1600 m 
(2 mi * 1600 m/mi) / (12.5 min * 60 s/min) = 1800 / 750 = 2.4 m/s