Sarah is planning her study schedule for an upcoming exam. She has 18 hours available over 3 days and wants to allocate her time such that she studies at least 2 hours more on Day 2 than on Day 1, and twice as much on Day 3 as on Day 2. How many hours should she allocate to each day to meet her requirements? Let's think step by step and output the final answer within \boxed{}.
user