Toshkent metrosi "Chilonzor" yo'lining uzunligi 17,5 km ga teng bo'lib 17 ta bekatdan iborat. Ushbu yo'nalishda qatnayotgan poyezd birinchi bekatdan qo'zg'algach oxirgi bekatgacha yetib kelishi uchun 40 daqiqa vaqt sarflaydi. Poyezd har bir bekatda yo'lovchilar chiqib olishi uchun 20 sekund to'xtab turadi. Poyezdning harakat vaqtidagi o'rtacha tezligini (km/h) toping.

  1. 25,6
  2. 40
  3. 28,8
  4. 30

📝 Detailed explanation

17 ta bekat orasida 16 ta oraliq bor. 1-bekatdan qo'zg'aladi va 17-bekatda to'xtaydi — oraliq 15 ta bekatda yo'lovchilar uchun to'xtaydi.
To'xtab turish vaqti: 15·20 = 300 s = 5 min.
Sof harakat vaqti: 40 − 5 = 35 min = 35/60 soat = 7/12 soat.
O'rtacha tezlik: v = 17,5/(7/12) = 17,5·12/7 = 30 km/h.
Javob: 30 km/h.
5 / 36 (14%)
Question 5 of 36
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