[
  "Add the two times by converting both mixed numbers to improper fractions with a common denominator. LCM of 3 and 12 is 12.",
  "1 1/3 = 4/3 = 16/12. 1 7/12 = 19/12. 16/12 + 19/12 = 35/12.",
  "35/12 = 2 11/12 hours. Answer: 2 11/12 (option D)."
]