A Runner Planned Her Strategy for Running a Half Marathon

A runner planned her strategy for running a half marathon, a distance of 13.1 miles.She planned to run negative splits, faster speeds as time passed during the race.In the actual race, she ran the first 6 miles in 48 minutes, the second 4 miles in 28 minutes and the last 3.1 miles in 18 minutes.What was her average velocity over the first 6 miles? What was her average velocity over the entire race? Did she run negative splits?

A) 7.50 mph for the first 5 miles, 8.36 mph for the race, No
B) 8.36 mph for the first 5 miles, 7.50 mph for the race, No
C) 8.12 mph for the first 5 miles, 7.35 mph for the race, Yes
D) 7.35 mph for the first 5 miles, 8.12 mph for the race, No