If you're reading this, you probably know my dad is a math teacher. Some of his students were wondering the other day how long the flight to London is. You ask, I answer...

SHORT ANSWER:
I'll spend eight hours in the plane from Minneapolis to London.

LONG ANSWER:

I leave at 7:00 P.M. CDT (Central Daylight Time, which is UTC-5) from Minneapolis. I arrive in London at 9:00 BST (British Summer Time, which is UTC+1).

So, after the time conversion, it's like leaving at 7:00 P.M. CDT and arriving at 3:00 A.M. CDT or leaving at 1:00 A.M. BST and arriving at 9:00 A.M. BST. A simple subtraction then yields a flight time of eight hours.

* UTC = Universal Coordinated Time, basically GMT (Greenwhich Mean Time)