{
  "hints": [
    "First check if she can make it: Time = Distance / Speed at 80 km/h.",
    "30 / 80 = 0.375 h = 22.5 min. This is more than 20 min, so NO.",
    "Required speed = 30 / (20/60) = 30 x 3 = 90 km/h."
  ]
}