[mairdie]

My first husband was a high energy physicist and on his PhD exam at the University of Chicago they asked how you could tell how fast the boat was going on Lake Michigan if you couldn’t see land.

[Alberta's Child]

I'd be curious to know how that question would be answered. I could figure out how to do a rough measurement, but I'm sure it's wrong for a PhD exam where they're probably expecting some precision.

I just got this problem wrong on my first try, too. LOL.