Advanced maths

Fifteen 12-year-old boys finish 8 pizzas in approx 6 mins 34 secs. Each pizza is divided in 12 slices.

a) how many slices per boy per second?

b) how much football cake can they possibly eat after that?

*dies*

I was in England recently, London, to be precise. There was this concert... And I'll leave you to guess... :)