Предмет: Математика, автор: Tanya29111

расстояние между городами А и Б равно 460 км из А В Б выехал грузовик со скоростью 50 километров в час через 2 часа из в навстречу ему выехал легковой автомобиль со скоростью 70 километров в час через сколько часов после выезда машины встретиться

Ответы

Автор ответа: Inf777
0

Правильно вопрос к задаче звучит так: через сколько часов после выезда грузовика машины встретятся?

==============================================

1) 50 * 2 = 100 км - успел проехать грузовик, когда выехал легковой автомобиль

2) 460 - 100 = 360 км - расстояние, которое нужно проехать обоим до встречи

3) 50 + 70 = 120 км/ч - скорость сближения

4) 360 : 120 = 3 ч - до встречи

5) 2 + 3 = 5 ч

Ответ: после выезда грузовика машины встретятся через 5 часов.

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