Determine the difference between speed of two persons.
[tex]8-7=1[/tex]
So the distance between two person is change at the speed of 1 mph.
Determine the time for the distance of seperation be 0.75 miles.
[tex]\begin{gathered} t=\frac{0.75\text{ miles}}{1\text{ mph}} \\ =0.75\text{ hours} \end{gathered}[/tex]
So answer is 0.75 hours.
