Предмет: Математика, автор: Adikoshhhh

Катер плыл по течению реки со скоростью 2км/час с первого причала ко второму за 4.5 часов. Собственная скорость катера 18км/час. Сколько км между двумя причалами?

Ответы

Автор ответа: Малинка2012

расстояние - х

х/(18+2)+х/(18-2)=4,5
х/20+х/16=4,5
4х/80+5х/80=4,5
9х/80=4,5
9х=360
х=40 (км) - расстояние

Автор ответа: Малинка2012

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