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Катер с собственной скоростью 20км/ч проплыл 4 часа по течению реки и 6 - часов против течения. Весь путь катера составил 196км. Найдите скорость течения реки.
Ответы 1
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Пусть скорость течения реки - х км/ч.(20+x)*4+(20-x)*6=19680+4*x+120-6*x=1962*x=4x=2Ответ: 2 км/ч.
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Автор:
tessa69 - 5 лет назад
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