Question

Решение текстовых задач с помощью уравнений. Урок 4 Путешественники плыли на лодке из пристани A в пристань B по течению реки за 1,5 часа. После 30 минутной остановки на пристани B, они вернулись в пристань A за 1,5 часа на катере, скорость которого в 2 раза больше скорости лодки. Скорость реки равна 4 км/ч. 1) Перетащи следующие нужные элементы в пустые ячейки. , , , , , , , , v (км/ч) t (ч) S = vt (км) Лодка по течению реки Катер против течения реки 2) Составь и реши уравнение относительно пути, исходя из данных в таблице. (x+ 4) = ( x – ) 3) Скорость лодки км/ч. 4) Скорость катера км/ч. 5) Расстояние между пристанями км. билим ленд,помогите пожалуйста​

Answer 1

Ответ:

вот , только там баг x+4 почемуто считает ошибкой

Пошаговое объяснение:

Answer 2

Problem Analysis

To solve this problem, we need to find the speed of the boat and the speed of the motorboat, as well as the distance between the two ports. We are given that the boat traveled from port A to port B with the current in 1.5 hours, and then returned from port B to port A against the current in 1.5 hours using a motorboat that is twice as fast as the boat. The speed of the river current is given as 4 km/h.

Solution

Let's use the following variables: - v (km/h): speed of the boat - t (h): time taken by the boat to travel from port A to port B - S (km): distance between the two ports

We can use the formula S = vt to find the distance between the two ports.

From the given information, we know that the boat traveled from port A to port B with the current in 1.5 hours. Therefore, the time taken by the boat to travel from port B to port A against the current is also 1.5 hours.

We are also given that the speed of the motorboat is twice the speed of the boat. Therefore, the speed of the motorboat is 2v km/h.

Now, let's set up the equation to find the distance between the two ports:

(v + 4) * 1.5 = (2v - 4) * 1.5

Simplifying the equation:

1.5v + 6 = 3v - 6

6 + 6 = 3v - 1.5v

12 = 1.5v

Dividing both sides of the equation by 1.5:

v = 8

Therefore, the speed of the boat is 8 km/h.

To find the speed of the motorboat, we can substitute the value of v into the equation:

2v = 2 * 8 = 16

Therefore, the speed of the motorboat is 16 km/h.

Now, let's find the distance between the two ports using the formula S = vt:

S = 8 * 1.5 = 12

Therefore, the distance between the two ports is 12 km.

Answer

Based on the given information, the speed of the boat is 8 km/h, the speed of the motorboat is 16 km/h, and the distance between the two ports is 12 km.