Предмет: Алгебра, автор: Аноним

УМОЛЯЮ ВАС ПОМОГИТЕ МНЕ!!!

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Автор ответа: miron2077

х собственная скорость х+2 скорость по течению
х-2 против течения
4(х+2)=5(х-2)
4х+8=5х-10
х=18км/час
18+2=20км/час скорость по течению
20*4=80км расстояние

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