Question

Помогите,прошу Сандра бегает в 2 раза быстрее,чем Бренда,а Бренда в 2 раза быстрее чем Николь.Они одновременно стартовали из одной точки кольцевой дороги:Сандра побежала в одну сторону,а Бренда и Николь-в другую.Сначала Сандра встретила Бренду,а через 200 метров-Николь.Чему равна длина дорожки?

Answer 1

200:2 *15=1500(м) длина дорожки

Answer 2

Problem Analysis

We are given the following information: - Sandra runs twice as fast as Brenda. - Brenda runs twice as fast as Nicole. - Sandra met Brenda first, and then 200 meters later, she met Nicole.

We need to find the length of the track.

Solution

Let's assume that Nicole's speed is x meters per second. Based on the given information, we can calculate the speeds of Brenda and Sandra.

- Brenda's speed = 2x meters per second (since Brenda runs twice as fast as Nicole). - Sandra's speed = 4x meters per second (since Sandra runs twice as fast as Brenda).

Now, let's consider the time it takes for Sandra to meet Brenda and Nicole.

- Time taken for Sandra to meet Brenda = Distance / Relative Speed - Time taken for Sandra to meet Nicole = (Distance + 200) / Relative Speed

Since Sandra met Brenda first, the time taken to meet Brenda should be less than the time taken to meet Nicole.

- Distance / (4x - 2x) < (Distance + 200) / (4x)

Simplifying the above inequality, we get:

- Distance < 200

Therefore, the distance of the track is less than 200 meters.

Answer: The length of the track is less than 200 meters.

Note: Since the exact length of the track is not provided in the given information, we cannot determine the exact length. We can only conclude that it is less than 200 meters based on the given conditions.