Question

Из 2 городов,расстояние между которыми 900км, одновременно навстречу друг другу вышли 2 поезда.Скорость первого поезда 45км/ч.а второго 55км/ч.Через сколько часов поезда встретятся?

Answer 1

900:(45+55)=9(ч)
ответ. 9ч

Answer 2

общая скорость 

1 действие 45 + 55=100 км ч они движутся на встречу друг другу 

2 действие 900/100=9 часов через столько они встретятсЯ 

Answer 3

Problem Analysis

We are given that two trains start simultaneously from two cities that are 900 km apart. The first train has a speed of 45 km/h, and the second train has a speed of 55 km/h. We need to determine how many hours it will take for the trains to meet.

Solution

To solve this problem, we can use the formula:

Time = Distance / Speed

Let's calculate the time it takes for each train to cover the distance between the two cities.

1. Time taken by the first train: - Distance = 900 km - Speed = 45 km/h - Time = Distance / Speed = 900 km / 45 km/h = 20 hours

2. Time taken by the second train: - Distance = 900 km - Speed = 55 km/h - Time = Distance / Speed = 900 km / 55 km/h ≈ 16.36 hours (rounded to two decimal places)

Since the second train takes less time to cover the distance, we can conclude that the trains will meet after approximately 16.36 hours.

Answer

The trains will meet after approximately 16.36 hours.