Answer:
6.7 ft/s
Step-by-step explanation:
distance = speed × time
time = distance/speed
Assume the race distance was 200 ft (it doesn't matter what distance we choose).
For the first 100 ft: time = 100 ft × 1 s/6.20 ft = 16.13 s
For the second 100 ft: time = 100 ft × 1 s/7.75 ft = 12.90 s
For the whole 200 ft: total time = 29.03 s
Average speed = total distance/total time = 200 ft/29.03 s = 6.7 ft/s
