If you're going 80mph how long will it take to go 80 miles?

A friend posted this vid of her asking another friend a simple question which she somehow had difficulty answering and the vid has now gone viral with over 1M views. 
Not sure what's up with this 80 mph question but apparently it's stumping everyone. Check out the 2nd vid below...

Jaymie McGill

 

Daymon Moore