The contrapositive of the statement

Let $\mathrm{p}$ denotes statement

$\mathrm{p}$ : I reach the station in time.

q: I will catch the train.

Contrapositive of $\mathrm{p} \rightarrow \mathrm{q}$

is $\sim \mathrm{q} \rightarrow \sim \mathrm{p}$

$\sim \mathrm{q} \rightarrow \sim \mathrm{p}:$ I will not catch the train, then $\mathrm{I}$ do not reach the station in time.