По течению реки катер за 7 часов столько же километров, столько он проходит за 8 ч против течения. собственная скорость катера 30 км/ч. найдете скорость течения реки. заранее !
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29.07.2019 06:40
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2
240-8x=210+7x
7x+8x=240-210
15x=30
x=30:15
x=2км/ч скорость течения реки