The tracker app uses GPS to measure the position $($lon$,$ lat$)$ of the runner at regular time intervals of $1$s$,$ taking a total of N measurements from the start t$0$ to the end tN$1$ of the run. We will always use the Unix timestamp standard as the format of our data $($to double precision$).$ For instance, $00$:$001$ Jan $2024$ had the timestamp $1704067200\mathrm{.}0.$ You can use the online tool https:$//$www$.$epochconverter.com if you want to convert between timestamps and human$-$readable time & date format, although this is not necessary for this problem