Question

Автомобиль проехал 300 км. первую половину пути он двигался со скоростью 100 км/ч, а вторую -60км/ч. найдите среднюю скорость автомобиля. ответ, выраженный в километрах в час.

Answer 1

150:100=1,5ч-1 половина
150:60=2,5ч-вторая половина
1,5+2,5=4ч весь путь
300:4=75км/ч средняя скорость

Answer 2

Calculating the Average Speed of the Car

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

Average Speed = Total Distance / Total Time

The car traveled 300 km, with the first half at a speed of 100 km/h and the second half at a speed of 60 km/h.

Let's calculate the total time taken for the journey and then use it to find the average speed.

Calculating Total Time Taken

The time taken for the first half of the journey can be calculated using the formula:

Time = Distance / Speed

For the first half: - Distance = 300 km / 2 = 150 km - Speed = 100 km/h

Using the formula, the time taken for the first half is: Time1 = 150 km / 100 km/h = 1.5 hours

For the second half: - Distance = 300 km / 2 = 150 km - Speed = 60 km/h

Using the formula, the time taken for the second half is: Time2 = 150 km / 60 km/h = 2.5 hours

Calculating Average Speed

Now, we can calculate the total time taken for the journey: Total Time = Time1 + Time2 = 1.5 hours + 2.5 hours = 4 hours

Using the formula for average speed: Average Speed = Total Distance / Total Time = 300 km / 4 hours = 75 km/h

Therefore, the average speed of the car for the entire journey is 75 km/h.