An explorer is caught in a whiteout while returning to camp. He was supposed to travel due north for 5.0 km, but when the snow clears, he discovers that he actually traveled 7.8 km at 48° north of due east. (a) How far must he now travel to reach base camp? (b) In what direction must he travel (counterclockwise from due east)? I thought I understood what to do, but apparently I don't since I keep getting the wrong answer. how do I start this problem and how do I figure out part b.