Ben and jerry scheduled a four day mountain hike during summer vacation. the distance traveled is listed below (draw this out on a scratch sheet of paper if needed.) day 1: 10 km west and spent night at a hiker's inn. day 2: 10 km west and night in a tent. day 3: 10 km west and then they turned around and went back to the inn because ben left his allergy medicine. what was ben and jerry's total displacement from home when they arrived at the inn?