Question

Автомобиль прошел 2ч со скоростью 69 км/ч и 4ч со скоростью 72 км/ч.Найдите среднюю скорость.

Answer 1

69:2=34,5
72:4=18
34,5
_
18

Answer 2

2ч*69км/ч=138км
4ч*72км/ч=288км
288км+138км=426 км
426км:6ч=71км/ч средняя скорость

Answer 3

Calculation of Average Speed

To find the average speed of a car that traveled for 2 hours at a speed of 69 km/h and for 4 hours at a speed of 72 km/h, we can use the formula:

Average Speed = Total Distance / Total Time

To calculate the total distance, we need to find the distance traveled during each leg of the journey.

For the first leg, the car traveled for 2 hours at a speed of 69 km/h. Therefore, the distance covered during this leg is:

Distance1 = Speed1 * Time1 = 69 km/h * 2 hours = 138 km.

For the second leg, the car traveled for 4 hours at a speed of 72 km/h. Therefore, the distance covered during this leg is:

Distance2 = Speed2 * Time2 = 72 km/h * 4 hours = 288 km.

Now, we can calculate the total distance:

Total Distance = Distance1 + Distance2 = 138 km + 288 km = 426 km.

The total time is the sum of the times taken for each leg:

Total Time = Time1 + Time2 = 2 hours + 4 hours = 6 hours.

Finally, we can calculate the average speed:

Average Speed = Total Distance / Total Time = 426 km / 6 hours = 71 km/h.

Therefore, the average speed of the car is 71 km/h.

Please note that the calculations are based on the given information and may vary depending on the specific context or additional factors.