Pergunta de entrevista da empresa Big Fish Games

In the second phone screen, I was asked a design problem: how would you design and develop a method which takes a time-range as parameter and says if the person's calendar is busy in that time-range. I started off with an OO approach, not directly diving into the method details but the classes (and attibutes) i could be using. and arrived at a mediocre solution ( i guess) I dont think the interviewer was listening to my approach at all, cause the next thing he tells me, he wants to ask me some terminology questions and if i have knowledge of OO design.