Question

Реши задачу с помощью уравнения. Расстояние между посёлком и городом - 81 км. Из них одновременно на встречу друг другу выехали два велосипедиста и встретились через 3 часа. Скорость велосипедиста, выехавшего из города,-12км/ч. Какова скорость другого велосипедиста? Помогите пожалуйста с математикой задача с уравнением!!!!!

Answer 1

Ответ:

Пошаговое объяснение:

Х×3+12×3=81

3х+36=81

3х=81-36

3Х=45

Х=45÷3

Х=15

15км/час скорость 2 велосипедиста

Answer 2

Problem Analysis

We are given that the distance between a village and a city is 81 km. Two cyclists start simultaneously from the village and the city and meet each other after 3 hours. The speed of the cyclist who started from the city is 12 km/h. We need to find the speed of the other cyclist.

Solution

Let's assume the speed of the other cyclist (who started from the village) is x km/h.

We can use the formula: Speed = Distance / Time to solve this problem.

The time taken by both cyclists to meet each other is 3 hours. The distance traveled by the cyclist who started from the city can be calculated as 12 km/h * 3 hours = 36 km.

Since the total distance between the village and the city is 81 km, the distance traveled by the cyclist who started from the village can be calculated as 81 km - 36 km = 45 km.

Now, we can set up the equation:

Distance traveled by the cyclist who started from the village = Speed of the cyclist who started from the village * Time taken

Substituting the values we have:

45 km = x km/h * 3 hours

Simplifying the equation:

45 km = 3x km/h

Dividing both sides of the equation by 3:

15 km = x km/h

Therefore, the speed of the other cyclist (who started from the village) is 15 km/h.

Answer

The speed of the other cyclist is 15 km/h.