Предмет: Алгебра, автор: NotkaSol

Из пунктов А и В, расстояние между которыми 6км, одновременно вышли навстречу друг другу два пешехода. После их встречи пешеход, шедший из А, пришёл в В через 24 мин, а шедший из В пришел в А через 54 мин. На каком расстоянии от пункта А встретились пешеходы?

Ответы

Автор ответа: Nastya012
0
Путь скорости пешеходов= "х" и "у", тогда:
{0,4х+0,9у=6; => y=(6-0.4x)/0.9
{6/у - 6/х = 1/2
5.4/(6-0.4x) - 6/x=1/2
10.8x-72+4.8x=6x-0.4x^2
x^2+24x-180=0
х1=-30 не учит. как отриц.
х2=6 кмч
Расстояние от т-ки встречи до пункта В=0,4*6=2,4 км
От пункта А до т-ки встречи=6-2,4=3,6 км
Предыдущий вопрос
Следующий вопрос
Похожие вопросы
Предмет: Английский язык, автор: vasya8446
Task 1. Read the text and write what sentences are True or False.

Hobbies differ like tastes. If you have chosen a hobby according to your character and taste - you are lucky because your life becomes more interesting. Hobbies are divided into four large classes: doing things, making things, collecting things, and learning things.
The most popular hobby group is doing things. It includes a wide variety of activities, everything from gardening to traveling and from chess to volleyball. Gardening is one of the oldest man's hobbies. It is well-know fact that the English are very found of gardening and growing flowers, especially roses.
Both grown-ups and children are found of playing different computer games. This is a relatively new hobby but it is becoming more and more popular. Making things includes drawing, painting, making sculpture, designing costumes, handicrafts and others. Two of the most famous hobby painters were President Eisenhower and Sir Winston Churchill. Some hobbyists write music or play musical instruments.
President Bill Clinton, for example, plays the saxophone. Almost everyone collects something at some period of his/her life: stamps, coins, matchboxes, books, records, postcards, toys, watches and other things. Some collections don't have real value. Others become so large and so valuable that they are housed in museums and art galleries. Many world famous collections started in a small way with one or two items. People with a good deal of money often collect paintings, rare books and other art object. Often such private collections are given to museums, libraries and public galleries so that others might see them.
No matter what kind of hobby a person has, he/she always has the opportunity of learning from it. By reading about the things he/she is interested in, he/she adds to what he knows. Learning things can be the most exciting aspect of a hobby. So I think that everyone should have a hobby, it is like the target of your life.

1. The English are very found of gardening and growing fruit and vegetables, especially roses.
2. Most of people are found of playing different computer games.
3. Doing things includes drawing, painting, making sculpture, designing costumes, handicrafts and others.
4. President Eisenhower and Sir Winston Churchill were two of the most famous hobby painters.
5. Many private collections aren’t given to museums, libraries and public galleries.
6. Studying new things can be the most exciting aspect of a hobby.


(6 points)







Writing
Task 2. Write sentences about your hobby. You should write full sentences. Use some connectors and linking words but, and, because, when, while, etc. Include the following information:

Example: I like skiing because it is a healthy activity.

What your hobby is?
_____________________________________________________________________________
_______________________________________________________________
When and who you usually do it with?
_____________________________________________________________________________
_______________________________________________________________
Why you like doing it?
_____________________________________________________________________________
_______________________________________________________________
Is your hobby popular among teenagers?
____________________________________________________________________________________________________________________________________________________________

(4 points)
6 лет назад
Предмет: Английский язык, автор: kekziskskzo
Помогите пожалуйста
6 лет назад
Предмет: Английский язык, автор: Karodn
Помогите упр 8 пожалуйста
6 лет назад
Предмет: Геометрия, автор: Jylia1

ПОМОГИТЕ!!!!!!СРОЧНО:(

 

две окружности с центрами в точках О1 и О2 касаются внешним образом в точке А. Докажите, что общая касательная этих окружностей, проходящая через точку А, перпендикулярна О1О2
10 лет назад
Предмет: Математика, автор: vtx
из двух поселков выехали одновременно навстречу друг другу два всадника. первый ехал со средней скоростью200 м/мин., а второй проезжал в минутуна 20 м меньше. всадники встретились через 50 мин. найти расстояние между поселками
10 лет назад