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Ответ

Ответ дан
kseniyaStas
это легко:
x - скорость товарного поезда
x+30 - скорость скорого поезда
6*(x+30)-8x=60
6x+180-8x=60
2x=120
x=60 - скорость товарного поезда
60+30=90 - скорость скорого поезда
вот и все

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