Two law students, John and Marsha, are planning an all-nighter to prepare for their law boards the following day. Between them they have one set of materials in the following five subjects: contracts, torts, civil law, corporate law, and patents. Based on their previous experience, they estimate that they will need the following amount of time (in hours) with each set of materials:

They agree that Marsha will get the opportunity to see each set of notes before John. Assume that they start their studying at 8:00 P.M. Determine the exact times that each will begin and end studying each subject in order to minimize the total time required for both to complete studying all five subjects.