please do it fast

June is driving from Brookline, Massachusetts, to Brooklyn, New
York. The cities are 200 miles apart. Pretend June lives in a world in
which she encounters no traffic jams and can drive at a constant
speed of 50 mph the entire way. Consider the following function.
The distance June has traveled, c , is a function of her driving
time, t.
What is the domain of this function?