Вопрос школьника по предмету Математика
Две машины ехали из пункта А в пункт В. Они выехали и прибыли одновременно. 1-ая машина ехала половину пути со скоростью 80км/час, потом 51 минуту стояла на ремонте и вторую половину пути ехала со скоростью 100км/час. Вторая машина ехала всю дорогу со скоростью 70км/час. Найдите расстояние между пунктами А и В.
Ответ учителя по предмету Математика
x/70-(0.5x/80+0.5x/100)=51/60
x/70-(0,00625x+0,005x)=0.85
x/70-0,01125x=0.85
0,01428571x-0,01125x=0.85
0,00303571x=0.85
x=0.85/0,00303571
x=280
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