The locations where the passneger travels can be shown as,
The position of passenger at city A can be expressed as,
The position of passenger at city B can be expressed as,
The position of passenger at city C can be expressed as,
Therefore, the magnitude of distance of city C can be calculated as,
Thus, the distance of city C from point O is 252.3 km.
The direction of location is calculated as,
Thus, the direction of city C from point O is -65.5 degree.