Question

Автомобиль первые 20 мин двигался со скоростью 90 км/ч следующие 40 мин -со скоростью 120 км/ч. Какова средняя скорость автомобиля.

Answer 1

20 минут=1/3 часа
90*1/3=30км-расстояние которое проехал автомобилист двигаясь со скоростью 90км/ч
40 минут=2/3 часа
120*2/3=80км
S=80+30=110км
t=1/3+2/3=1ч
V=S/t=110/1=110км/ч
Ответ:110км/ч средняя скорость

Answer 2

Средняя скорость автомобиля-108 км.ч

Answer 3

Calculation of Average Speed

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

Given: - The car traveled at a speed of 90 km/h for the first 20 minutes. - The car then traveled at a speed of 120 km/h for the next 40 minutes.

To find the total distance traveled, we can calculate the distance traveled at each speed and then sum them up.

Distance traveled at 90 km/h for 20 minutes: - Convert 20 minutes to hours: 20 minutes = 20/60 = 1/3 hour - Distance = Speed × Time = 90 km/h × 1/3 hour = 30 km

Distance traveled at 120 km/h for 40 minutes: - Convert 40 minutes to hours: 40 minutes = 40/60 = 2/3 hour - Distance = Speed × Time = 120 km/h × 2/3 hour = 80 km

Total distance traveled = 30 km + 80 km = 110 km

To find the total time taken, we can add the time taken at each speed.

Total time taken = 20 minutes + 40 minutes = 60 minutes = 1 hour

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

Average Speed = Total Distance Traveled / Total Time Taken

Average Speed = 110 km / 1 hour = 110 km/h

Therefore, the average speed of the car is 110 km/h.