Question

Половину времени движения из одного города в другой автомобиль перемещался со скоростью 60км/ч. С какой скоростью он двигался во второй половине времени своего пути, если средняя скорость автомобиля равна 65км/ч?

Answer 1

Vср=(V1+V2)/2
V2=2*Vср-V1=65*2-60=70км/ч

Answer 2

Calculation of the Speed in the Second Half of the Journey

To calculate the speed at which the car was moving in the second half of its journey, we can use the formula for average speed:

Average Speed = Total Distance / Total Time

Given that the average speed of the car is 65 km/h and it traveled at a speed of 60 km/h for the first half of the journey, we can set up the following equation:

65 km/h = Total Distance / Total Time

Since the car traveled at a speed of 60 km/h for the first half of the journey, we can assume that the second half of the journey was also covered at the same speed. Let's denote the time taken for the first half of the journey as 't' hours. Therefore, the time taken for the second half of the journey would also be 't' hours.

The total time for the entire journey would be the sum of the time taken for the first half and the time taken for the second half, which is 2t hours.

Now, let's calculate the total distance traveled. Since the car traveled at a speed of 60 km/h for the first half of the journey, the distance covered in the first half would be 60 km/h multiplied by 't' hours, which is 60t km.

Similarly, the distance covered in the second half of the journey would also be 60t km.

Substituting the values into the equation for average speed, we get:

65 km/h = (60t km + 60t km) / (2t hours)

Simplifying the equation, we have:

65 km/h = 120t km / 2t hours

Simplifying further, we get:

65 km/h = 60 km/h

Therefore, the car was moving at a speed of 60 km/h in the second half of its journey.