Miss Luster’s 3rd grade class participated in the school’s Language Arts contest to read and write in their journals every day for one month. For each of the first 10 days, Haven read for m minutes and wrote in her journal for 15 minutes. For each of the last 20 days, Haven read for m minutes and wrote in her journal for 30 minutes. Choose all of the expressions that represent how long Haven spent reading and writing in her journal during the contest.