⟩ A man woke up one morning to find that one of the wheels of his car had a completely flat tire. Despite this he set off in his car and drove 100 miles to visit a customer. He then drove 100 miles home. He did not repair or inflate the flat tire. How did he manage to make the journey?
The flat tire was on the man's spare wheel which he kept in the car trunk. The four wheels he drove on all had properly inflated tires.