{
  "question_id": 1178,
  "hints": [
    {"hint_level": 1, "hint": "The full distance is 640 m. You have 192 m left to go."},
    {"hint_level": 2, "hint": "Subtract what is left from the total to find how far you have already walked."},
    {"hint_level": 3, "hint": "640 - 192 = ?"}
  ]
}