Jade and her roommate Jari commute to work each morning, traveling west on I-10. One morning Jade left for work at6:40A.M.,but Jari left20minuteslater. Both drove at a constant speed. The following graphs show the distance (in miles) each of them has traveled onI-10at timet(in minutes), wheret= 0

is7:00 A.M.Distance

traveled (mi)Time Since 7:00 A.M. (min)

(a) Use the graph to decide which of them is traveling faster.

Jade

Jari

(b) Find the speed (in mi/h) at which each of them is driving.Jari

mi/hJademi/h

(c) Find linear functionsfandgthat model the distances that Jade and Jari travel as functions oft(in minutes).Jarid(t)=

Jaded(t)=