Question

Из одной точки круговой трассы,длина которой равна14км,одновременно в одном направлении стартовали 2 автомоб.Скорость первого автомоб равна 80км/ч,и через 40 минут после старта он опережал второй автомобиль на один круг.Найдите скорость второго автомобиля.

Answer 1

40мин=2/3час
80*2/3=160/3=53 1/3(км) - расстояние проехал І автомобиль за 2/3час
53 1/3 - 14=39 1/3(км) - проехал ІІ автомобиль за 2/3час
 39 1/3 : 2/3=59(км/ч) - скорость ІІ автомобиля
ІІ способ:
х км/ч - скорость ІІ автомобиля
80 * 2/3 - 2х/3=14
160 \3 - 2х/3=14
160-2х=42
2х=160-42
2х=118
х=118:2
х=59(км/ч) - скорость ІІ автомбиля.

Answer 2

Problem Analysis

We are given the following information: - There is a circular track with a length of 14 km. - Two cars start simultaneously in the same direction. - The speed of the first car is 80 km/h. - After 40 minutes, the first car overtakes the second car by completing one lap.

We need to find the speed of the second car.

Solution

To solve this problem, we can use the formula:

Speed = Distance / Time

Let's calculate the time it takes for the first car to complete one lap.

The length of the circular track is 14 km. Since the first car completes one lap in 40 minutes, we can calculate the speed of the first car as follows:

Speed of the first car = Distance / Time = 14 km / 40 minutes

Now, let's calculate the speed of the second car. Since the first car overtakes the second car by completing one lap, the time taken by the second car to complete one lap is 40 minutes.

Speed of the second car = Distance / Time = 14 km / 40 minutes

Therefore, the speed of the second car is 14 km / 40 minutes.

Answer

The speed of the second car is 14 km / 40 minutes.