rosa is fastest, jose is slowest
use distance/time to figure the speed
before anything convert the values so that it can be km/h
so basically make the times all to hours is what I did through dividing the minutes by 60
letty
3km÷(40/60)hrs = 4.5km/h
jose
6km ÷ 2hrs= 3km/h
pedro
6km ÷ (90/60) hrs = 4km/h
rosa
9km ÷ (1+(20/60)) hrs = 6.75km/h
therefore rosa is the fastest walking at a speed of 6.75km/h whereas jose is the slowest, walking at a speed of 3km/h