August 2021 0 7 Report

Поезд прошел первую половину пути со скоростью 40 км/ч,а вторую- со скоростью 60 км/ч. Какова средняя скорость движения поезда?

Ответ должен быть 48 км/ч. Нужно решение) помогите,пожалуйста)

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