Average pay is approximately $36K per year for those with five to nine years of experience. Broken down by tenure, the largest share of Richmond County Board of Education employees (36 percent) have 10-19 years of experience and earn $53K annually on average. Jobs. The highest paychecks go to Middle School Teachers, who earn $48K per year.
Velocity is a vector quantity, and average velocity can be defined as the displacement divided by the time.
Your speed,  throughout, is 10 metres per second and so that is your average  speed.    But your average velocity is the total displacement vector divided  by the total time. This is   100*sqrt(2) metres due NE/20 sec = 7.07 metres per second due North  East.