. The data in the table below gives times and distances for a marathoner at selected points in the race.
time in minutes 0 40 55 95 129
miles from start 0 8 12 20 26
a. Find the runner's average rate of change (speed in miles per minute) for the 26 miles included
in the table.
b. Approximate the instantaneous speed at the half-marathon spot (13.1 miles).
c. Which of the intervals shown in the table was the slowest for the runner?n