Question

Два велосипедиста отправились из одного поселка одновременно в противоположных направлениях.Через 30 минут расстояние между ними было 15 км.Средняя скорость одного из них 260м/мин.Узнай среднюю скорость другого велосипедиста.(Вырази 15 км в метрах) Составь и реши обратную задачу мне нужно только решение обратной задачи

Answer 1

Прямая:

Скорость второго велосипедиста x м/мин. За 30 мин первый проехал 260*30 = 7800 м, второй 30x м, всего они проехали 15 км = 15000 м, то есть

30x+7800 = 15000

30x = 7200

x = 240 м/мин - скорость второго вел-та.

 

Обратная:

Два велосипедиста отправились из одного поселка одновременно в противоположных направлениях.Через 30 минут расстояние между ними было 15 км.Средняя скорость одного из них 240 м/мин. Узнай среднюю скорость другого велосипедиста.

 

Решение обратной точно такое же, как и решение прямой, ответ 260 м/мин.

Answer 2

Problem Analysis

Two cyclists start from the same village simultaneously in opposite directions. After 30 minutes, the distance between them is 15 km. The average speed of one of the cyclists is given as 260 m/min. We need to find the average speed of the other cyclist.

Solution

To solve this problem, we can use the formula: speed = distance / time.

Let's denote the average speed of the first cyclist as v1 and the average speed of the second cyclist as v2.

Given that the distance between the two cyclists after 30 minutes is 15 km, we can convert this distance to meters by multiplying it by 1000: distance = 15 km = 15,000 m.

We also know that the time is 30 minutes, which is equivalent to 30 * 60 = 1800 seconds.

Using the formula, we can write two equations:

1. For the first cyclist: v1 = distance / time 2. For the second cyclist: v2 = distance / time

Substituting the values, we get:

1. For the first cyclist: v1 = 15,000 m / 1800 s 2. For the second cyclist: v2 = 15,000 m / 1800 s

Now we can calculate the average speed of the second cyclist.

Calculation

Let's calculate the average speed of the second cyclist using the given values.

For the first cyclist: - Distance: 15,000 m - Time: 1800 s

Using the formula, we can calculate the average speed of the first cyclist: v1 = 15,000 m / 1800 s = 8.33 m/s.

Now, let's calculate the average speed of the second cyclist using the same values: v2 = 15,000 m / 1800 s = 8.33 m/s.

Answer

The average speed of the second cyclist is 8.33 m/s.

Note: The average speeds of both cyclists are the same because they cover the same distance in the same time.