Difference between Knowledge and Wisdom

From my brother but sounds like something my husband would have done :)

THE FINAL EXAM...........

At Penn State University were four sophomores taking chemistry and all of
them had an 'A' so far. These four friends were so confident that, the
weekend before finals, they decided to visit some friends and have a big
party. They had a great time but, after all the hearty partying, they slept
all day Sunday and didn't make it back to Penn State until early Monday
morning.

Rather than taking the final then, they decided that after the final they
would explain to their professor why they missed it. They said that they
visited friends but on the way back they had a flat tire. As a result, they
missed the final.

The professor agreed they could make up the final the next day. The guys
were excited and relieved. They studied that night for the exam. The next
day the Professor placed them in separate rooms and gave them a test
booklet. They quickly answered the first problem worth 5 points. Cool, they
thought! Each one in separate rooms, thinking this was going to be easy....
then they turned the page.

On the second page was written...


For 95 points: Which tire?