Birinchi case uchun. Har bir odam eng tez o'ta oladigan odam bilan birga o'tib kelsa bo'ldi.

A crosses in 1 minute
B crosses in 4 minutes
C crosses in 5 minutes
D crosses in 8 minutes

Javob: 19

Ikkinchi caseda bu logic ishlamaydi, ikkinchi o'tishda eng slowestlar birga o'tvolish kerak bo'ladi. Masalani yo'g'li joyi shu.

A crosses in 1 minute
B crosses in 2 minutes
C crosses in 5 minutes
D crosses in 8 minutes

Javob: 15

Men tashagan examplega 19 deganlar isbotlay olganlarga qoyil.

Ikkinchi case ajoyibligi uchun buni ham ulashdim.