Question

Из двух городов расстояние между которыми 470 км одновременно навстречу друг другу выехали два поезда. скорость одного поезда 48 км в час. С какой скоростью шел второй поезд если они встретились через 5 часов

Answer 1

48  * 5 = 240 км прошёл 1-й поезд
470 - 240 = 230 км прошёл 2-й поезд до встречи
230 / 5 = 46 км/ч скорость второго поезда
Ответ 46 км/ч 

Answer 2

Problem Analysis

We are given that two trains start simultaneously from two cities that are 470 km apart and are moving towards each other. The speed of one train is given as 48 km/h. We need to find the speed of the second train if they meet after 5 hours.

Solution

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

The distance covered by the first train in 5 hours is given by: Distance1 = Speed1 × Time = 48 km/h × 5 h = 240 km.

The distance covered by the second train in 5 hours is given by: Distance2 = Speed2 × Time = v km/h × 5 h = 5v km.

Since the two trains meet, the sum of the distances covered by both trains should be equal to the total distance between the cities: Distance1 + Distance2 = 470 km.

Substituting the values of Distance1 and Distance2, we get: 240 km + 5v km = 470 km.

Simplifying the equation, we have: 5v km = 470 km - 240 km.

Solving for v, we get: v = (470 km - 240 km) / 5 km/h.

Calculating the value of v, we have: v = 230 km / 5 h = 46 km/h.

Therefore, the speed of the second train is 46 km/h.

Answer

The second train was traveling at a speed of 46 km/h.