[
  "Add the two distances by converting both mixed numbers to improper fractions with a common denominator. LCM of 2 and 5 is 10.",
  "1 1/2 = 3/2 = 15/10. 2 3/5 = 13/5 = 26/10. 15/10 + 26/10 = 41/10.",
  "41/10 = 4 1/10 km. Answer: 4 1/10 (option C)."
]