Предмет: Математика, автор: spirkacsofia639

Теплохід пройшов 30 км за течією річки і повернувся назад.
Скільки годин тривала подорож, якщо власна шіидкість теплохода 17.5
км/год, а швидкість течії річки 2,5 км/год. ?

Ответы

Автор ответа: maksim85625

Ответ:

х скорость течения

27+х скорость по течению

27-х против

30/(27+х)+30/(27-х)=2,25

810-30х+810+30х=1640,25-2,25х²

2,25х²=1640,25-1620

х²=9

х=3км/час скорость течения

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