The value of the slope of the graph of the velocity versus time between 10 minutes and 20 minutes would be .06. I got to this answer by getting the changes in the rise (y) over run (x) of the table:
slope = y2- y1 / x2-x1 = .8-.2 / 20-10 mi / min = .6 / 10 min = .06
Then for the follow up question, the slope represents the distance traveled of the toy car (in miles).
