Question

рaстояние между двумя стaнциями рaвно 768км. От них одновременно нaвстречу друг другу отошли двa поездa и встретились через 6 ч после нaчaлa движения . Скорость одного из поездов рaвнa 72 км/ч Нaйдите скорость второго поездa?

Answer 1

1) 768 : 6=128 (км /ч) скорость сближения поездов.

2) 128 - 72=56 (км /ч ) скорость второго поезда.

Ответ :скорость второго поезда 56 км/ч.

Answer 2

1)768:6=128(км/ч)-скорость сближения

2)128-72=55(км/ч)-скорость второго поезда

 

 

Answer 3

Problem Analysis

We are given that the distance between two stations is 768 km. Two trains start simultaneously from these stations and meet after 6 hours. The speed of one of the trains is given as 72 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 find the distance traveled by each train.

The first train travels for 6 hours at a speed of 72 km/h, so the distance it travels is: distance_1 = 72 km/h × 6 h = 432 km.

The second train also travels for 6 hours at a speed of x km/h, so the distance it travels is: distance_2 = x km/h × 6 h = 6x km.

Since the total distance between the two stations is 768 km, we can write the equation: distance_1 + distance_2 = 768 km.

Substituting the values of distance_1 and distance_2, we get: 432 km + 6x km = 768 km.

Now, we can solve this equation to find the value of x.

Calculation

Let's solve the equation 432 km + 6x km = 768 km to find the value of x.

Subtracting 432 km from both sides of the equation, we get: 6x km = 768 km - 432 km.

Simplifying the right side of the equation, we have: 6x km = 336 km.

Dividing both sides of the equation by 6, we get: x km = 336 km / 6.

Calculating the value of x, we have: x = 56 km/h.

Answer

The speed of the second train is 56 km/h.