linear function

Question

Jacqueline leaves city A at 2:00 p.m. and drives at a constant speed, traveling west on I-90. She passes city B, 40 mi from city A, at 2:50 p.m.

a) Find a linear function d that models the distance (in mi) she has traveled after t min

b) At what speed (in mi/h) is Jacqueline traveling

Answer 1

r = d / t

r = 40 / (5 / 6)

r = 48

d = 48t