Answer
(a) $d = 0.8~t$ (with $t$ in minutes)
(b) We can see the graph below.
(c) The slope of the line is $~~0.8~mi/min~~$ (or $48~mi/hr$) and this represents the speed of the car.
Work Step by Step
(a) $\frac{distance}{time} = \frac{40~mi}{50~min} = 0.8~mi/min$
We can write an equation for the distance $d$ in terms of the time $t$:
$d = 0.8~t$
(b) We can see the graph below.
(c) The slope of the line is $~~0.8~mi/min~~$ and this represents the speed of the car.
