Предмет: Математика, автор: соняканакина

Из двух сел по грунтовой дороге выехали одновременно навстречу друг другу два автомобиля. Первый за 2,4 часа проехал 9/70 всего расстояния между селами, а второй за 2 часа проехал 13/170 этого расстояния. С какой скоростью ехал первый автомобиль, если до места встречи второй проехал 351 км? Пожалуйста, с решением

Ответы

Автор ответа: ndusha

х-расстояние
9/70*х:2,4=9/70*1/2,4*х=9/70*10/24*х=9/7*1/24*х=3/7*1/8*х=3/56х-скорость 1го
13/170*х:2=13/170*1/2х=13/340х-скорость 2го
3/56х+13/340х=255/4760х+182/4760х=437/4760х-скорость сближения
х:437/4760х=1:437/4760=4760/437ч- через столько встетятся

351:4760/437=351*437/4760=153387/4760=32 1067/4760км/ч-скорость первого

Вы в условии уверены? :-)

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