From point A to point B$,$or run $0\mathrm{.}8$km south from point A to point c and then paddle $0\mathrm{.}2$km east to point B or run south from point A to some point D and paddle to point B $.$ If she run $8\mathrm{.}1$km$/$m and paddle $2\mathrm{.}4$km$/$m what distance should she run before paddle to reach the boat as quickly