2) you are running a marathon. during the
first 20 miles, your average speed is 8 miles
per hour. during the last 6.2 miles, you
increase your average speed by 2 miles per
hour. how long will it take you to run the
last 6.2 miles of the marathon?

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?