Puzzles and Brain Teasers Pop Quiz

Sam went to katil at 8:30pm, and wound up his old wind-up alarm clock. He set it to wake him up at 9:00am. How many hours sleep did Sam get?
Choose the right answer:
Option A 30 minit
Option B 12 hours, 30 minit
Option C 5 hours
Option D None of these options
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