In an attempt to escape his island, Gillian builds a raft and sets to sea. The wind shifts a great deal during the day, and he is blown along the following straight lines: 2.5 km 450 north of west; then 4.70 km 60% south of east; then 5.1 km straight east; then 7.2 km 55 south of west; and finally 2.8 km 10 north of east. What is his final position relative to the island? (a) in km (b) in south of east