Предмет: Математика, автор: роми2

решите : с одной станции одновременно в противоположных направлениях вышли два поезда. скорость первого 56 км/ч а скорость другого составляет 7/8 скорости первого поезда . через сколько времени расстояние между ними станет равно 420 км?
решите быстрееееееееееееееее

Ответы

Автор ответа: servicebess

Найдем общую скорость

$V = 56+ \frac{7}{8}*56= 56 + 7*7 = 56+49 = 105$

Теперь найдем через сколько времени расстояние будет 420 км

420 / 105 = 4 часа

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