I’m sure you’ve had this discussion before, but I couldn’t find it in a search.
First, the puzzle:
You’re driving a race car on a one mile oval track. You drive one lap at 30 MPH. How fast do you have to drive the second lap in order to average 60 MPH for BOTH laps?
I first saw this in Ask Marilyn several years ago. (Marilyn, BTW, along with Isaac Asimov and James Randi are my heroes!) She got plenty of letters from people, many angry, because they couldn’t understand the answer.
When I present this to people I know, the immediate (and wrong) answer is “90 MPH.” My older brother (PHD) is the only person I know who got it right.
I won’t give the answer yet, but my main question is Why do people have such a problem figuring this one out?