I stuck on this question. Please give me hint on this.

Question 3: (16 points) Suppose that Delphine and Cosima have identical , preferences, but Delphine is naive while Cosima is sophis- ticated. They both have an exam in two days, and they are deciding how much to study today and tomorrow. (a) Suppose that, today, Delphine decides that she would most like to study for 2 hours today and 6 hours tomorrow, whereas Cosima decides that she would most like to study for x hours today and y hours tomorrow. Briefly discuss what we can conclude about x and y? (b) Discuss what Delphine's and Cosima's actual behavior is likely to look like.