There is no limitation on ‘time’ given in the ‘test question’.
Nonsense. The limitation on time is prescribed by the usage of “velocity”, which is by definition “distance per unit of time”, and the measure is given also within the problem: mph.
Think of it in terms of “time” and not “speed” and it will make sense.
It is fundamentally a time, not speed, problem. Took me a min or two to wrap my head around it which is why I am not a physicist but rather an economist.
I despise Physics. Makes my head hurt. ;)