Below is my favorite question of all time. It has been years since it was recounted to me so I can’t attribute it; however I always end up pulling it out in conversations to have a bit of fun with guests, especially those with math, engineering or physics backgrounds.
You have a one mile race track in the shape of a loop. A man is wants to race around the track twice with an average speed of 60 miles per hour. The racer completes the first lap going 30 m.p.h.
How fast does the racer have to go on the second lap to make his average speed 60 m.p.h over the 2 lap race?
Hint: If the answer were 90 m.p.h, this wouldn’t be a very good question would it?