Question

Автомобиль ехал по шоссе 4 ч со скоростью 70 км/час. . Потом он свернул на грунтовую дорогу и за 2 ч проехал путь, на 180 км меньше пути движения по шоссе. С какой скоростью двигался автомобиль по грунтовой дороге?

Answer 1

1)70*4=280 (км) - ехал по шоссе
2)(280-180):2=50 (км/ч)
Ответ: 50 км/ч двигался автомобиль по грунтовой дороге.

Answer 2

Calculation of Speed on the Gravel Road

To determine the speed at which the car was traveling on the gravel road, we can use the information provided. Let's break down the given information step by step:

1. The car traveled on the highway for 4 hours at a speed of 70 km/h. 2. Then, the car turned onto a gravel road and traveled for 2 hours. 3. The distance traveled on the gravel road is 180 km less than the distance traveled on the highway.

To find the speed on the gravel road, we need to calculate the distance traveled on the highway.

Calculating the Distance Traveled on the Highway

The distance traveled on the highway can be calculated using the formula:

Distance = Speed × Time

Given that the car traveled on the highway for 4 hours at a speed of 70 km/h, we can calculate the distance as follows:

Distance on the highway = 70 km/h × 4 hours

Calculating the distance:

Distance on the highway = 280 km

Calculating the Distance Traveled on the Gravel Road

We know that the distance traveled on the gravel road is 180 km less than the distance traveled on the highway. Therefore, we can calculate the distance traveled on the gravel road as follows:

Distance on the gravel road = Distance on the highway - 180 km

Substituting the value of the distance on the highway:

Distance on the gravel road = 280 km - 180 km

Calculating the distance:

Distance on the gravel road = 100 km

Calculating the Speed on the Gravel Road

To find the speed on the gravel road, we can use the formula:

Speed = Distance / Time

Given that the car traveled on the gravel road for 2 hours, we can calculate the speed as follows:

Speed on the gravel road = Distance on the gravel road / 2 hours

Substituting the value of the distance on the gravel road:

Speed on the gravel road = 100 km / 2 hours

Calculating the speed:

Speed on the gravel road = 50 km/h

Therefore, the car was traveling at a speed of 50 km/h on the gravel road.