{
  "hints": [
    "Convert 1.2 km to metres first: 1.2 km = 1200 m.",
    "Time at 40 m/min = 1200 / 40 = 30 min. This is more than 25 min, so YES he is late.",
    "Required speed = 1200 / 25 = 48 m/min."
  ]
}