Question

Два поезда идут навстречу друг другу. один прошел две пятых всего пути а другой половину . сколько км осталось им идти до встречи если между ними было 200 км

Answer 1

1 задача
1) 200:2=100 (км) прошёл второй поезд
2) 200:5=40 (км) 1 часть всего пути
3) 40*2=80 (км) - прошёл первый поезд
4) 200-100-80=20 (км) осталось идти до встречи

Answer 2

Пусть x - расстояние, которое прошел первый поезд, и y - расстояние, которое прошел второй поезд.

Тогда у нас есть два уравнения: x = (2/5) * 200 y = (1/2) * 200

Решив эти уравнения, мы получаем: x = 80 км y = 100 км

Теперь мы можем найти расстояние, которое им осталось пройти до встречи: 200 - (80 + 100) = 20 км

Итак, им осталось пройти 20 км до встречи.

Answer 3

Problem Analysis

We have two trains traveling towards each other. One train has already covered two-fifths of the total distance, while the other train has covered half of the total distance. We need to determine how much distance is left for them to meet, given that the initial distance between them is 200 km.

Solution

To find the remaining distance, we need to calculate the sum of the distances covered by both trains and subtract it from the initial distance of 200 km.

Let's calculate the distance covered by each train:

- The first train has covered two-fifths of the total distance. Let's denote the total distance as d. Therefore, the distance covered by the first train is (2/5) * d. - The second train has covered half of the total distance. Therefore, the distance covered by the second train is (1/2) * d.

To find the remaining distance, we subtract the sum of the distances covered by both trains from the initial distance of 200 km:

Remaining distance = 200 km - [(2/5) * d + (1/2) * d]

Now, let's calculate the remaining distance.

Calculation

Given that the initial distance between the trains is 200 km, we can substitute this value into the equation:

Remaining distance = 200 km - [(2/5) * d + (1/2) * d]

Simplifying the equation:

Remaining distance = 200 km - [(4/10) * d + (5/10) * d]

Remaining distance = 200 km - [(9/10) * d]

Since we don't have the exact value of d, we cannot calculate the remaining distance accurately. However, we can provide a general formula to calculate the remaining distance based on the total distance d:

Remaining distance = 200 km - [(9/10) * d]

Please note that the actual value of the remaining distance will depend on the specific value of d.

Conclusion

To summarize, the remaining distance for the two trains to meet depends on the total distance between them, denoted as d. The remaining distance can be calculated using the formula:

Remaining distance = 200 km - [(9/10) * d]

Please provide the specific value of d to get an accurate calculation of the remaining distance.