Question

Автомобиль 3 ч ехал со скоростью 60 км/ч , а затем 2 ч ехал со скоростью 40 км/ч. Какова средняя скорость автомобиля.

Answer 1

3*60=180
2*40=80
180+80=260
260/5=52

Answer 2

Calculating Average Speed of the Car

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

Average Speed = Total Distance / Total Time

First, let's calculate the total distance traveled by the car.

The car traveled at a speed of 60 km/h for 3 hours, and then at a speed of 40 km/h for 2 hours.

Total Distance = (Speed1 * Time1) + (Speed2 * Time2)

Total Distance = (60 km/h * 3 h) + (40 km/h * 2 h)

Total Distance = (180 km) + (80 km)

Total Distance = 260 km

Now, let's calculate the total time taken.

Total Time = Time1 + Time2

Total Time = 3 hours + 2 hours

Total Time = 5 hours

Now, we can calculate the average speed using the formula:

Average Speed = Total Distance / Total Time

Average Speed = 260 km / 5 hours

Average Speed = 52 km/h

So, the average speed of the car over the entire journey is 52 km/h.