Nick The Marathon Man
Riddle: Nick timed himself and found out that if he wore a bright white outfit he ran 20 miles in 80 minutes, but when he wore a dark outfit, he ran 20 miles in one hour and twenty minutes. What does this mean for his next race?
Answer: Nothing, as 80 minutes equals an hour and twenty minutes.
Source: https://www.riddles.com/index.php/634
