Alfredo leaves camp and, using a compass, walks 4 km E, then 6 km S, 3 km E, 5 km N, 10 km W, 8 km N, and, finally, 3 km S. At t
he end of two days, he is planning his trip back. To get back to camp, Alfredo should travel a distance of ----------? km in a direction
---------------? ° south of east.
