Предмет: Алгебра, автор: lizadiachuk060606

Швидкість човна у стоячій воді дорівнює 20 км/год. Роман за течією проплив 12 км і витратив на це стільки часу, скільки плив проти течії 8 км. Обчисли швидкість течії річки.

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Автор ответа: annsh1855

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