Friday’s Quiz

Thankfully, although he is no longer my ‘official’ boss, he is still providing the Friday quiz. So, here?s the problem for today:

So, you?re driving back to work after lunch one wintry day and you pass the electronic billboard outside the bank that shows the time and temperature. On your way home, you pass the same billboard. You notice that the Farenheit temperature has dropped 36 degrees. But the Celsius temperature is still the same. What?s going on?

Good luck!