Предмет: Алгебра, автор: tea241

20 баллов ❤️✨☺️
Лодка плыла 4 часа против течения реки и 3 часа по её течению,и всего проплыла 68 км.Какова собственная скорость лодки,если скорость течения реки 2 км/ч
Пожалуйста помогите.Только надо расписать,что обозначаем за X,но если не можете ,то можно и без этого.Но желательно,как я сказала☝✋✌‍♂️‍♂️‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍♂️‍‍‍‍

Ответы

Автор ответа: Felozia
0
1. Пусть собственная скорость лодки х км/ч. Скорость лодки по течению (х+2), против - (х-2). Всего лодка проплыла (4*(х-2)+3*(х+2)) км, что по ус-вию з-чи равно 68 км.
2. Решим уравнение.
4*(х-2)+3*(х+2)=68
4х-8+3х+6=68
7х=70
х=10.
3. Собственная скорость лодки 10 км/ч.
Ответ: 10 км/ч.
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