Question

Автомобиль двигался 3,2 часа по шоссе со скоростью 90 километров час затем 1,5 часа по грунтовой дороге со скоростью 45 километров в час за конец 0,3 часа по проселочной дороге со скоростью 30 км в час найдите среднюю скорость движения автомобиля на всем пути заранее спасибо

Answer 1

  3.2*90=288 км                                                                                                                      1.5*45=67.5 км                                                                                                                                           0.3*30=9 км                                                                                                                                           288+67.5+9=364.5  это весь путь                                                                                                            90+45+30=165 это вся скорость                                                                                                            364.5-165=199.5 км в час                                                                                                  

Answer 2

Calculation of Average Speed

To find the average speed of the car on the entire journey, we need to calculate the total distance traveled and the total time taken.

Given information: - The car traveled for 3.2 hours on the highway at a speed of 90 kilometers per hour. - The car traveled for 1.5 hours on a dirt road at a speed of 45 kilometers per hour. - The car traveled for 0.3 hours on a country road at a speed of 30 kilometers per hour.

To calculate the total distance traveled, we need to sum up the distances traveled on each type of road. Since we are given the time and speed for each segment, we can use the formula:

Distance = Speed × Time

For the highway segment: Distance on the highway = 90 km/h × 3.2 h

For the dirt road segment: Distance on the dirt road = 45 km/h × 1.5 h

For the country road segment: Distance on the country road = 30 km/h × 0.3 h

To find the total distance, we add up the distances traveled on each segment:

Total distance = Distance on the highway + Distance on the dirt road + Distance on the country road

Now that we have the total distance traveled, we can calculate the average speed using the formula:

Average Speed = Total Distance / Total Time

Let's calculate the average speed step by step.

Calculation Steps:

1. Calculate the distance traveled on each segment: - Distance on the highway = 90 km/h × 3.2 h - Distance on the dirt road = 45 km/h × 1.5 h - Distance on the country road = 30 km/h × 0.3 h

2. Calculate the total distance: - Total distance = Distance on the highway + Distance on the dirt road + Distance on the country road

3. Calculate the total time: - Total time = 3.2 h + 1.5 h + 0.3 h

4. Calculate the average speed: - Average speed = Total distance / Total time

Let's perform the calculations.

Calculation:

1. Calculate the distance traveled on each segment:

- Distance on the highway = 90 km/h × 3.2 h = 288 km - Distance on the dirt road = 45 km/h × 1.5 h = 67.5 km - Distance on the country road = 30 km/h × 0.3 h = 9 km

2. Calculate the total distance:

- Total distance = 288 km + 67.5 km + 9 km = 364.5 km

3. Calculate the total time:

- Total time = 3.2 h + 1.5 h + 0.3 h = 5 hours

4. Calculate the average speed:

- Average speed = Total distance / Total time = 364.5 km / 5 h = 72.9 km/h

Therefore, the average speed of the car on the entire journey is 72.9 kilometers per hour.

Please note that the above calculations are based on the given information and assumptions.