Предмет: Математика, автор: 6Alinka2014

Помогите решить задачу срочно: одновременно из двух городов вышли 2 поезда.Расстояние между городами 918 км.В пути они были 6 часов.Какова скорость 2 поезда,если скорость 1 поезда 65 км в час?

Ответы

Автор ответа: prettypushkova

х - скорость второго поезда
v = х + 65 (км/ч) - скорость сближения двух поездов
S = 918 км - расстояние между городами
t = 6 ч

v = S : t
х + 65 = 918 : 6
х + 65 = 153
х = 153 - 65
х = 88 (км/ч) - скорость второго поезда
Ответ: 88 км/ч

2 способ:
1) 918 : 6 = 153 км - такое расстояние проезжают два поезда навстречу друг другу за 1 час;
2) 153 - 65 = 88 км/ч - скорость второго поезда.

Автор ответа: 6Alinka2014

Мне 3 действие без уравнения нужно

Автор ответа: 6Alinka2014

Так как 1 действие сделано

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