{
  "question_id": 5108,
  "hints": [
    {
      "hint_level": 1,
      "hint": "Buses = s."
    },
    {
      "hint_level": 2,
      "hint": "Cars = 3 times s = 3s."
    },
    {
      "hint_level": 3,
      "hint": "Total = s + 3s = 4s."
    }
  ]
}