Use the table to answer the following questions. The marginal, or additional, gain from Juanita's first hour of work, from 8:00 AM to 9:00 AM, is The marginal gain from Juanita's third hour of work, from 10:00 AM to 11:00 AM, is Later, the teaching assistant in Juanita's physics course gives her some advice. "Based on past experience," the teaching assistant says, "working on 15 problems raises a student's exam score by about the same amount as reading the textbook for 1 hour." For simplicity, assume students always cover the same number of pages during each hour they spend reading. problems. problems. O 1 hour working on problems, 3 hours reading O2 hours working on problems, 2 hours reading O 3 hours working on problems, 1 hour reading O4 hours working on problems, 0 hours reading Given this information, in order to use her 4 hours of study time to get the best exam score possible, how many hours should she have spent working on problems, and how many should she have spent reading?