Question

Костя в первый час прошел 4 ( целых ) 2 / 5 км. а во второй час - на 3/ 5 км больше чем в первый час. за эти два часа он прошел на 5 ( целых ) 4 / 5 км больше, чем в третий час сколько километров прошел Костя за все 3 часа

Answer 1

1 час - 4целых 2/5 км
2 час - 4 целых 2/5 + 3/5 = 5 км
за 2 часа - 4целых 2/5 + 5 = 9 целых 2/5 км
3 час - 9 целых 2/5 - 5целых 4/5= 3целых 3/5 км
за 3 часа - 9целы 2/5 + 3целых 3/5 = 13 км

Answer 2

Problem Analysis

We are given the following information about Kostya's distance traveled: - In the first hour, he traveled 4 2/5 km. - In the second hour, he traveled 3/5 km more than in the first hour. - In the first two hours combined, he traveled 5 4/5 km more than in the third hour.

We need to find out how many kilometers Kostya traveled in total over the course of three hours.

Solution

Let's break down the problem step by step:

1. In the first hour, Kostya traveled 4 2/5 km. 2. In the second hour, he traveled 3/5 km more than in the first hour. So, in the second hour, he traveled 4 2/5 + 3/5 = 4 5/5 = 5 km. 3. In the first two hours combined, Kostya traveled 5 4/5 km more than in the third hour. So, the distance he traveled in the third hour is 5 km less than the total distance traveled in the first two hours. Therefore, the distance traveled in the third hour is 5 4/5 - 5 = 4/5 km. 4. To find the total distance traveled in three hours, we add the distances traveled in each hour: 4 2/5 km + 5 km + 4/5 km = 13 km.

Therefore, Kostya traveled a total of 13 kilometers in three hours.

Answer

Kostya traveled a total of 13 kilometers in three hours.