humour

A professor, wanting to test the limits of his pupils’ perception, asks the following question: “I a road is 200 metres long and 10 metres wide, how old does that make me?”. All the students are quiet execpt for one that yells:
“Forty-four sir”
“I’m impressed! How did you come up with that answer?”
“You see, my brother is 22 years old and he’s half-nuts”