The graph below shows the height through which an elevator travels, y, in x seconds: a graph is shown with x axis title as time in seconds. the title on the y-axis is height of elevator above ground in feet. the values on the x-axis are from 0 to 5 in increments of 1 for each grid line. the values on the y-axis are from 0 to 50 in increments of 10 for each grid line. a line is shown connecting points at ordered pairs 1,10 and 2, 20 and 3, 30 and 4, 40. the title of the graph is rate of ascent. what is the rate of change for the relationship represented in the graph? fraction 1 over 40 fraction 1 over 10 10 40