Question

Помогите: Андрей был на рыбалке. До реки он ехал на велосипеде, а обратно шел пешком. На весь путь он затратил сорок минут. В другой раз он и туда и обратно ехал на велосипеде. И затра­тил всего двадцать минут. А сколько времени понадобится Андрею, чтобы пройти путь в оба конца пешком?

Answer 1

х-пешком

у-велосипед

х+у=40 минут

2у=20 минут

у=10 минут

х+10=40

х=30

(туда обратно 2х)

2х=60 минут

1 час

Answer 2

 

х-пешком

у-велосипед

х+у=40 минут

2у=20 минут

у=10 минут

х+10=40

х=30

туда обратно 2х

2х=60 минут

1 час

 

Answer 3

Problem Analysis

To solve this problem, we need to determine the time it takes for Andrey to walk the entire distance both ways. We know that Andrey rode his bicycle to the river and walked back, taking a total of 40 minutes. On another occasion, he rode his bicycle both ways and took only 20 minutes. We need to find out how long it would take Andrey to walk the entire distance both ways.

Solution

Let's denote the time it takes Andrey to ride to the river as x minutes and the time it takes him to walk back as y minutes. We are given the following information: 1. x + y = 40 (Andrey rode to the river and walked back, taking a total of 40 minutes). 2. 2x = 20 (Andrey rode both ways and took only 20 minutes).

We can solve this system of equations to find the values of x and y.

Solving the Equations

From equation 2, we can find the value of x: 2x = 20 x = 10

Now, we can substitute the value of x into equation 1 to find the value of y: 10 + y = 40 y = 30

Answer

Andrey would take 30 minutes to walk the entire distance both ways.

Checking the Sources

The solution provided is based on the given problem and the mathematical calculations derived from it. No specific external sources were used for this solution.