Предмет: Алгебра, автор: Аноним

Пассажирский поезд должен пройти с постоянной скоростью 50 км/ч расстояние между станциями . Когда он прошел половину пути, то был задержан у семафора на 12 мин, а затем, чтобы приехать вовремя машинист увеличил скорость поезда на 10 км/ч. Какое расстояние между станциями?(только с инета не списывать)

Ответы

Автор ответа: sangers1959

Пусть расстояние между станциями. 12 мин=0,2 часа ⇒
(x/2)/50)=(x/2)/(50+10)+0,2
x/100=x/120+0,2 |×600
6x=5x+120
x=120
Ответ: x=120 км.

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