Question

Из города А в город В,расстояние между которыми 560 км,одновременно выехали два автомобиля:первый-со скоростью 80 км/ч,а второй-75 км/ч. Спрашивается:1)на сколько километров первый автомобиль удаляется от второго за 1 час??? 2)Какое расстояние будет между автомобилями через 3 часа???? 3)За какое время расстояние между ними станет равным 25 км??? 4)Через сколько часов первый автомобиль приедит в город В???? Всё нужно решать действиями!!!!!!!!За ранее спасибо....!!!!

Answer 1

1.)80-75=5
2.)5*3=15
3) 25:5=5
4) 560:80=7

Answer 2

1) 80-75=5км 
2) 3*5=15 км
3)25:5=5ч
4)560:80=7 ч

Answer 3

Problem Analysis

We are given two cars traveling from City A to City B, a distance of 560 km. The first car is traveling at a speed of 80 km/h, and the second car is traveling at a speed of 75 km/h. We need to find the following:

1. The distance the first car is ahead of the second car after 1 hour. 2. The distance between the cars after 3 hours. 3. The time it takes for the distance between the cars to become 25 km. 4. The time it takes for the first car to reach City B.

Solution

Let's solve each part of the problem step by step.

1. To find the distance the first car is ahead of the second car after 1 hour, we can simply multiply the speed of the first car by the time, which is 80 km/h * 1 hour = 80 km. Therefore, the first car is 80 km ahead of the second car after 1 hour.

2. To find the distance between the cars after 3 hours, we need to calculate the distance traveled by each car. The first car travels at a speed of 80 km/h for 3 hours, covering a distance of 80 km/h * 3 hours = 240 km. The second car travels at a speed of 75 km/h for 3 hours, covering a distance of 75 km/h * 3 hours = 225 km. Therefore, the distance between the cars after 3 hours is 240 km - 225 km = 15 km.

3. To find the time it takes for the distance between the cars to become 25 km, we need to set up an equation. Let's assume t is the time in hours. The distance traveled by the first car is 80 km/h * t hours, and the distance traveled by the second car is 75 km/h * t hours. We can set up the equation: 80t - 75t = 25 km. Simplifying the equation, we get 5t = 25 km. Dividing both sides by 5, we find t = 5 hours. Therefore, it takes 5 hours for the distance between the cars to become 25 km.

4. To find the time it takes for the first car to reach City B, we need to calculate the time it takes for the first car to cover the entire distance of 560 km. The first car travels at a speed of 80 km/h, so the time it takes is 560 km / 80 km/h = 7 hours.

Summary

Here are the answers to the given questions:

1. The first car is 80 km ahead of the second car after 1 hour. 2. The distance between the cars after 3 hours is 15 km. 3. The time it takes for the distance between the cars to become 25 km is 5 hours. 4. The first car will reach City B in 7 hours.

Please let me know if you need any further assistance!