Предмет: Математика, автор: UNayaB

Из двух городов,расстояние между которыми 1200км,вышли одновременно навстречу друг другу два поезда.Один из них проходит это расстояние за 20 ч,другой-за 30ч.Через сколько часов поезда встретятся?

Ответы

Автор ответа: katiy

1200/20=60км/ч скорость одного

1200/30=40км/ч скорость второго

60+40=100км/ч скорость общая

1200/100=12часов

Автор ответа: катрин1976

1)1200/60=60(КМ/Ч)-v 1 тепл
2)1200/30=40(км/ч)-v 2 тепл
3)60+40=100(км/ч)-общ.v
4)1200/100=12(ч)-встр 2 поезда

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