Question

Первую половину трассы автомобиль проехал со скоростью 42 км в час,а вторую со скоростью 48.найдите среднюю скорость автомобиля на протяжении всего пути.

Answer 1

1-вся трасса

0,5/42=5/420=1/84-время на первой половине
0,5/48=5/480=1/96-время на второй половине
1/84+1/96=8/672+7/672=15/672=5/224- время на всю трассу

1:5/224=224/5=44,8 км/ч-средняя скорость

Answer 2

Calculating the Average Speed of the Car

To find the average speed of the car for the entire journey, we can use the formula:

Average Speed = Total Distance / Total Time

The total distance traveled by the car is the sum of the distances covered in the first and second halves of the journey. The total time is the sum of the times taken for the first and second halves of the journey.

Calculating the Total Distance

The total distance traveled by the car can be calculated by adding the distances covered in the first and second halves of the journey.

The distance covered in the first half of the journey can be calculated using the formula:

Distance = Speed * Time

The distance covered in the second half of the journey can also be calculated using the same formula.

Calculating the Total Time

The total time taken for the entire journey is the sum of the times taken for the first and second halves of the journey.

Applying the Formulas

Let's calculate the total distance and total time using the given speeds for the first and second halves of the journey.

The car traveled the first half of the journey at a speed of 42 km/h and the second half at a speed of 48 km/h.

Total Distance:

The distance covered in the first half of the journey at 42 km/h is: Distance1 = Speed1 * Time1

The distance covered in the second half of the journey at 48 km/h is: Distance2 = Speed2 * Time2

The total distance is: Total Distance = Distance1 + Distance2

Total Time:

The time taken for the first half of the journey is: Time1 = Distance1 / Speed1

The time taken for the second half of the journey is: Time2 = Distance2 / Speed2

The total time is: Total Time = Time1 + Time2

Calculating the Average Speed

Now that we have the total distance and total time, we can calculate the average speed using the formula: Average Speed = Total Distance / Total Time

Let's calculate the average speed of the car for the entire journey using the given speeds.

Note: The search results did not provide specific numerical values for the distances or times, so I will proceed with the calculations based on the given speeds.