Alyson walks 2 3/4 blocks to school. Katie walks 3 1/4 blocks to school. If Robert walks as far as Alyson and Katie combined, how long is Robert's walk to school?
Raymond spent 1/6 of an hour completing his math homework, 3/6 working on spelling, 2/6 reading and 5/6 preparing his geography project. What mixed number represents the total amount of time Raymond spent on his homework?