Answer:
a) 27 minutes
b) (1/9) miles per minute = 0.1111 miles per minute
c) 0.0911 miles per minute
Explanation:
a) How long did it take Aidan to run from mile marker 1 to mile marker 4?
This is just the sum of the time it took Aidan to run from mile marker 1 to mile marker 4 = 7 + 20 = 27 minutes.
b) Average speed = (Total distance travelled)/(Total time taken)
Distance from mile marker 1 to mile marker 4 = 3 miles
Total time taken = 27 minutes
Average speed = 3/27 = 0.1111 miles/minute
c) Average speed = (Total distance travelled)/(Total time taken)
Total distance between mile marker 9 and the end of the race = 13.1 - 9 = 4.1 miles
Time left out of 115 minutes to complete the race and after spending 70 minutes to reach mile 9 = 115 - 70 = 45 minutes
Average speed required for the final phase to finish the half-marathon in 115 minutes = 4.1/45 = 0.0911 miles/minute