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2.1.10-masala.Bir poezd A punktdan jo`natilgandan 2 soat o`tgach,ikkinchi poezd ham shu yo`nalishda jo`nadi va 10 soatdan so`ng birinchi poyezdga yetib oldi.Agar ularning o`rtacha tezliklari yig`indisi 110 km/soat bo`lsa, ikkinchi poezdning o`rtacha tezligini toping.

A)60 B)50 C)55 D)65



Yechish:Birinchi poyezdning o`rtacha tezligini V1 bilan,ikkinchi poyezdning o`rtacha tezligini V2bilan belgilaylik.Masala shrtiga ko`ra,V1+V2=110 km/soatga teng. Ikkinchi poyezd 10 soatda bosib o`tgan yo`lini,birinchi poyezd 12 soatda bosib o`tgan ya`ni, S= V1*12 , S=V2*10 ga teng.Ularni tenglashtirsak

V1*12= V2*10;

V1= ni V1+V2=110 ga qo`ysak,

+ V2=110, 11V2=660, V2=60 km/soat

Demak to`g`ri javob:A




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