Question

Из двух городов,расстояние между котрыми 651 километр,вышли одновременно навстречу друг другу два поезда.Двигаясь с постоянной скоростью,они встретились через 7 часов.Скорость одного поезда 45км/ч.Найди скорость второго поезда.

Answer 1

1) 45*7=315
2) 651-315=336
3)336:7=48 км\ час

Answer 2

Problem Analysis

We are given that two trains start simultaneously from two cities and travel towards each other. The distance between the two cities is 651 kilometers. The first train has a constant speed of 45 km/h. We need to find the speed of the second train.

Solution

Let's assume the speed of the second train is x km/h.

We can use the formula distance = speed × time to solve this problem.

The first train travels for 7 hours, so the distance it covers is 45 × 7 = 315 kilometers.

The second train also travels for 7 hours, so the distance it covers is x × 7 kilometers.

Since the two trains are traveling towards each other, the sum of the distances covered by both trains should be equal to the total distance between the cities, which is 651 kilometers.

Therefore, we can write the equation:

315 + (x × 7) = 651

Simplifying the equation:

x × 7 = 651 - 315

x × 7 = 336

Dividing both sides of the equation by 7:

x = 336 / 7

x = 48

Therefore, the speed of the second train is 48 km/h.

Answer

The speed of the second train is 48 km/h.