Isabel Canning, left, and Tatiana Lathion take the same class at Haverford College, but returned to very different homes after their campus closed. Ms. Canning is at her family’s vacation home in Boothbay, Maine, and Ms. Lathion is helping her parents’ food truck business in Jacksonville, Fla. Credits from left, Tristan Spinski for The New York Times, Charlotte Kesl for The New York Times