In one particular inertial reference frame, two events are observed to have the following space$-$time coordinates, expressed in $($x$,$y$,$z$,$t$)(,,,)$ format.

Event $1$:$(4\mathrm{.}32$km$,0\mathrm{.}00$km$,0\mathrm{.}00$km$,9\mathrm{.}51$s$)(4\mathrm{.}32$km$,0\mathrm{.}00$km$,0\mathrm{.}00$km$,9\mathrm{.}51$s$)$Event $2$:$(5\mathrm{.}98$km$,0\mathrm{.}00$km$,0\mathrm{.}00$km$,1\mathrm{.}74$s$)(5\mathrm{.}98$km$,0\mathrm{.}00$km$,0\mathrm{.}00$km$,1\mathrm{.}74$s$)$