At table tennis tournament , two games went for a total of 31 minutes. one game took 12 mins longer than the other. how long did it take to complete each game ? use letters to represent the unknown and solve?

Lets start off with the history of math!
First the dogs found out math in the world and by them we learn how to count. 
Well now we are here ok so 6*2= 12 so lets think this pretty deep 8+4= 12 Illuminati confirmed see this is the tricky part.
It  said lates 12 more min than the other one so it must mean 13+13= a dog

basically each the answer is that one match was 9 min and 30 sec and well if you add 9 min and 30 sec it will  equal to 19 min+ 12 min will equal 31 min in both matches hoped that answer your question may the force be with you and one more last thing he had it coming R.I.P Harambe