Предмет: Алгебра, автор: aiperiwaa

Поезд проехал третью часть расстояния между городами со скоростью 40км/ч а оставшийся путь со скоростью 60км/что поездка заняла 7 часов найти расстояние между городами?

Ответы

Автор ответа: juliika2001

Хкм - расстояние между городами

1/3Х :40 + 2/3Х :60 = 7

Х/120 + Х/90 = 7

3Х +4Х = 360х7

7Х = 2520

Х = 2520 :7

Х= 360 км

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