Free jokes

This past fall semester, at Duke University, there were two
sophomores who were taking Organic Chemistry and who did pretty
well on all of the quizzes and the midterms and labs, etc., such
that going into the final they had a solid 'A'. These two
friends were so confident going into the final that the weekend
before finals week, even though the Chem final was on Monday,
they decided to go up to University of Virginia and party with
some friends up there. So they did this and had a great time.
However, with their hangovers and everything, they overslept all
day Sunday and didn't make it back to Duke until early Monday
morning.

Rather than taking the final then, what they did was to find
Professor Aldric after the final and explain to him why they
missed the final. They told him that they went up to UVA for the
weekend, and had planned to come back in time to study, but that
they had a flat tire on the way back and didn't have a spare and
couldn't get help for a long time and so were late getting back
to campus.

Aldric thought this over and then agreed that they could make up
the final on the following day. The two guys were elated and
relieved. So, they studied that night and went in the next day
at the time that Aldric had told them. He placed them in
separate rooms and handed each of them a test booklet and told
them to begin.

They looked at the first problem, which was something simple
about free radical formation and was worth 5 points. "Cool" they
thought, "this is going to be easy." They did that problem and
then turned the page. They were unprepared, however, for what
they saw on the next page.

It said: (95 points) Which tire?

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