We had 3 hours to answer 4 questions. I used 5 minutes to answer one (I had it solved on a book) and the rest 2h 55min in other two.
The last question was very hard.
I was joking with a friend after the test: "We know that there are red roses. Based on that, determine the volumetric charge distribution in a cillindrical surface that goes to infinity and is in an heterogeneous medium.".