Two people, A and B, participated in the same exam and left the examination room at 10:00 AM, then had a meal at the same time. A said: "I left the examination room at the earlier of 2 hours before lunch and 1.5 hours after the exam started." B said: "I left the examination room at the later of 2.5 hours before lunch and 1 hour after the exam started." Try to find the time when the exam started and the time when they had their meal.
II. The exam start time and lunch start time are 9 AM, 12 PM or 8:30 AM, 12:30 PM.