Предмет: Алгебра, автор: ladyklepcha

Поезд вышел со станции с опозданием на 20 минут, но, повысив на 16 км/ч плановую скорость, через 160 км ликвидировал опоздание.Найдите плановую скорость.

Ответы

Автор ответа: goroxovamarija

уравнение:160/х-160/х+16=1/3,x^2+16x-7680=0.Д=7744=88^2. x=-8+88=80

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