Question

В первый день электровоз шёл 14 часов со скоростью 128 км\ч а второй день 4\7 от пройденного в первый день сколько всего часов был в пути электровоз двигаясь с одинаковой скоростью?

Answer 1

1) 14 * 128 = 1792 км прошел в первый день
2) 1792 * 4/7 = 1024 км прошел во второй день
3) 1024 : 128 = 8 часов шел во второй день
4) 14 + 8 = 22 часа был в пути всего

Answer 2

I will try to answer your question in detail. You asked: In the first day, the electric locomotive went 14 hours with a speed of 128 km/h and in the second day 4/7 of what it covered in the first day. How many hours was the electric locomotive in motion with the same speed?

To solve this problem, we need to find the distance covered by the electric locomotive in the first day, then multiply it by 4/7 to get the distance covered in the second day, and then divide the total distance by the speed to get the total time.

Let's denote the distance covered in the first day by D1, the distance covered in the second day by D2, the speed by V, and the total time by T.

We know that D1 = V * 14, since the electric locomotive went 14 hours with a speed of V.

We also know that D2 = 4/7 * D1, since the electric locomotive covered 4/7 of the first day's distance in the second day.

Therefore, the total distance is D1 + D2 = V * 14 + 4/7 * V * 14 = 18 * V.

To find the total time, we need to divide the total distance by the speed, so T = (18 * V) / V = 18.

Hence, the electric locomotive was in motion for 18 hours with the same speed.

If you want to learn more about the electric locomotive, you can check out these web search results:

- [A collection of problems on motion for grade 5](https://multiurok.ru/index.php/files/sbornik-zadach-na-dvizhenie-5-klass.html), which contains similar problems on motion in one direction. - [Electric locomotive - Wikipedia](https://ru.wikipedia.org/wiki/%D0%AD%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%BE%D0%B2%D0%BE%D0%B7), which gives the history and types of electric locomotives. - [Problems on motion in one direction](https://nsportal.ru/nachalnaya-shkola/matematika/2020/04/11/zadachi-na-dvizhenie-v-odnom-napravlenie), which provides more examples and explanations of how to solve such problems.