Answer: Average velocity of him is 0.75 m/sec to win the race.
Explanation:
Since we have given that
Distance he ran to beat him = 15 meters
Time he takes in a northern direction = 20 seconds
We need to find the average velocity need to be to win the race .
As we know that the velocity is the speed of particular object in a given direction.
So, the formula for average velocity is given by

Hence, average velocity of him is 0.75 m/sec to win the race.