The answers for questions 2, 3 and 4 were confirmed incorrect by the author today.
For question #1, they said they still believed it was 13 hours, not 14, however my latest working came out at 12 hours. I think I'll just take my chances on the exam.
(Pilot gets 2 hours extra rest because of the exceeded flight time. Take 10 hours rest between 10pm-6am plus the 1.5hrs between 2030 and 2200, and another 0.5 to make up the 2 hours, makes it 12 hours.)
No mention on how in question #5 someone can be on reserve at home and then a tour of duty for a total of 25 hours.