Question 959772
He sprints (10sec)*(10m/s)=100 meters at 10 m/s and
(90sec)*(4m/s)=360 meters at 4 m/s for a total of 
460 meters in 100 seconds so his average rate was:
460 m/100 sec=4.6 m/s
ANSWER: His average rate was 4.6 meters per second