Question

Из двух городов,расстояние между которыми 484 км,вышли одновременно навстречу друг другу два поезда.скорость одного поезда 45 км/час.Определите скорость другого поезда,если поезда встретелись через 4 часа.

Answer 1

1)4•45=180(км)проехал 1поезд за 4 часа.2)484-180=304(км)проехал 2 поезд за 4 часа.3)304:4=76(км/ч) Ответ:76(км/ч)скорость 2 поезда.

Answer 2

484:4=121 км в час скорость сближения поездов
121-45=76 км в час скорость второго поезда

Answer 3

Problem Analysis

We are given that two trains start simultaneously from two cities and are moving towards each other. The distance between the two cities is 484 km. We also know that the speed of one train is 45 km/h. We need to determine the speed of the other train if the trains meet after 4 hours.

Solution

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

We can use the formula: distance = speed × time to calculate the distance covered by each train.

The distance covered by the first train in 4 hours is: 45 km/h × 4 hours = 180 km.

The distance covered by the second train in 4 hours is: v km/h × 4 hours = 4v km.

Since the total distance between the two cities is 484 km, the sum of the distances covered by both trains should be equal to 484 km.

Therefore, we can write the equation: 180 km + 4v km = 484 km.

Simplifying the equation, we get: 4v = 484 km - 180 km = 304 km.

Dividing both sides of the equation by 4, we get: v = 304 km / 4 = 76 km/h.

Therefore, the speed of the second train is 76 km/h.

Answer

The speed of the second train is 76 km/h.

Explanation

When two trains start simultaneously from two cities and move towards each other, the distance covered by each train can be calculated using the formula: distance = speed × time. By setting up an equation with the given information, we can solve for the speed of the second train. In this case, the speed of the second train is found to be 76 km/h.