Предмет: Математика, автор: azot

Два поезда из одного пункта идут в противоположных направлениях. Сейчас между ними 100 км. Скорость одного-70 км.ч., а другого в одну целую две пятых раза меньше. через сколько времени между ними будет 170 км.?

Ответы

Автор ответа: OlesyaOooo

70:7/5=50км/час - скорость 2-ого поезда

50+70=120км-проходят оба поезда за час

120км - 60мин

70км - хмин

х= 4200:120

х=35 мин

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