Ari, Bobby, and Cathy each went for a walk yesterday afternoon. Ari walked 1, mile at a 2. 1 constant speed of 1, mi /h. Bobby walked 1 1 mi at a constant speed of 1 mi /h. Cathy walked for 1h and 21 min at a constant speed of 1, mi/h List the three people in order of the times they spent walking from least time to greatest time.

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?