SAT Question 3f5398a6: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

For a person $m$ miles from a flash of lightning, the length of the time interval from the moment the person sees the lightning to the moment the person hears the thunder is $k$ seconds. The ratio of $m$ to $k$ can be estimated to be $1$ to $5$. According to this estimate, the person is how many miles from a flash of lightning if the time interval is $25$ seconds?