They did so well on all the quizzes, midterms and labs, etc., that each

had

an "A" so far for the semester. These four friends were so confident with

the

finals approaching that the weekend before, they decided to go down to

Canberra

and party with some friends there. They had a great time. However, after all

the

hard partying, they slept all day Sunday and didn't make it back to Sydney

until

early Monday morning - the morning of their final exam! Rather than taking

the

final then, they decided to find their Professor after the exam and explain

to

him why they missed it. They explained that they had gone to Canberra to do

some

research in the ANU archives for the weekend with the plan to come back in

time

to study, but, unfortunately, they had a flat tire on the way back,didn't

have a

spare, and couldn't get help for a long time. As a result,they'd only just

arrived now! The professor thought it over and then agreed they could make

up

their final exam the following day. The guys were elated and relieved. They

studied hard that night - all night and went in the next day at the time the

professor had told them. He placed them in separate rooms and handed each of

them a test booklet, (which was out of 100 points) and told them to begin.

The

first problem was worth 5 points. It was something simple about free radical

formation. "Cool," they all thought in their rooms, "this is going to be

easy."

Each finished the problem and then turned the page for the next question -

Question 2 (for 95 points): Which tire was punctured?