[
  "Multiply: 450 m per day × 7 days = 3150 m.",
  "Divide by 1000 to get km: 3150 ÷ 1000 = 3.15 km = 3 km 150 m.",
  "3 km = 3000 m, remaining: 3150 - 3000 = 150 m."
]