Ответ:

  1. Masshtabga ko‘ra xaritadagi 1 sm haqiqatda 8 000 000 sm ga teng.
  2. 5 sm ga mos masofa: 5 × 8 000 000 = 40 000 000 sm.
  3. 100 000 sm = 1 km, shuning uchun 40 000 000 sm = 400 km.

Javob: B) 400 km.