Question

Автомобиль проехал 200 км за 7 ч, а затем 5 ч ехал со скоростью 80 км/ч. Определите среднюю скорость автомобиля на всем пути.

Answer 1

Vcp=Sоб/tоб
Sоб=s1+v2t2=200+5×80=600км
toб=7+5=12ч
Vср=600/12=15км/ч
Ответ 15км/ч

Answer 2

Calculation of Average Speed

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

The car first traveled 200 km in 7 hours, and then it traveled for 5 hours at a speed of 80 km/h.

To find the total distance traveled, we add the distance traveled in the first part of the journey to the distance traveled in the second part: - Distance in the first part = 200 km - Distance in the second part = speed * time = 80 km/h * 5 h = 400 km - Total distance = 200 km + 400 km = 600 km

To find the total time taken, we add the time taken in the first part of the journey to the time taken in the second part: - Time in the first part = 7 hours - Time in the second part = 5 hours - Total time = 7 hours + 5 hours = 12 hours

Now, we can calculate the average speed using the formula: Average Speed = Total Distance / Total Time

Substituting the values: Average Speed = 600 km / 12 hours = 50 km/h.

Therefore, the average speed of the car for the entire journey is 50 km/h.