Question

A car enters an interstate highway 20 mi north of a city. The car travels north at an average speed of 58 mph. Which equation models the car’s distance d from the city after traveling for h hours?

A.20h+ 58
B.58=20h+D
C.D=58h+20
D.20d=h+58

Answer 1

A. 20H + 58 is your answer

Answer 2

The car is already 20 miles north of the city at time zero. If the car continues north at the rate 58 mph, for h hours, the additional distance is then (58 mph)h. Thus, at any zero or positive time h, the car's distance "d" from the city is
d=20 miles + (58 mph)*h.