Finals

There were these two sophomores at Duke University who were taking Organic Chemistry. (Future med students, don't you know.) They had done reasonably well on all of the quizzes, midterms, labs. Going into the final exam, they had solid A's.

Well, even though the Chem final was on Monday, these two sophs were so confident ... (How confident were they?) ... they were so confident that, the weekend before finals week, they decided to go up to University of Virginia to party with some friends. Well, they had a great time.

However, they ended up staying rather longer than they planned, and did not make it back to Duke until early Monday morning. At that point, they were a bit tired. So, rather than taking the final then, they slept in and found their professor after the final.

They explained to him that they had missed the final because they had gone up to Virginia for the weekend, and, although they had planned to come back in time to study, they had a flat tire on the way back. Since they did not have a spare, they could not get help for a long time -- so they were late getting back to campus.

Thinking this story over, the professor finally agreed that they could make up the final the following day. Needless to say, the two guys were elated and relieved; and they studied all that night.

Next day, when they came to write the make-up exam, the professor placed them in separate rooms, handed each of them a test booklet, and told them to begin. The first problem was something simple about free radical formation and was worth 5 points. They figured they had the examination aced -- until they turned the page.

Question 2. (95 points)
"Which tire?"

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