The price of stock A at 9 am was $15.29. Since then, the price has been increasing at the rate of $0.08 each hour. At noon the price of stock B was $15.79. It begins to decrease at the rate of $0.09 each hour. If two rates continue, in how many hours will the prices of the two stocks be the same?

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?