Question

Если автомобиль проехал сначала 80 км со скоростью 40 км.ч,а потом проехал 200к с постоянной скоростью 100км/ч.Определите среднюю скорость его движения

Answer 1

280/4=70 км/ч ................

Answer 2

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.

The car first traveled 80 km with a speed of 40 km/h. To find the time taken for this part of the journey, we can use the formula:

Time = Distance / Speed

For the first part of the journey: Distance = 80 km Speed = 40 km/h

Time taken for the first part = 80 km / 40 km/h = 2 hours

The car then traveled 200 km with a constant speed of 100 km/h. Again, we can use the formula to find the time taken for this part of the journey:

For the second part of the journey: Distance = 200 km Speed = 100 km/h

Time taken for the second part = 200 km / 100 km/h = 2 hours

Now, we can calculate the total distance and total time taken for the entire journey:

Total distance = 80 km + 200 km = 280 km Total time taken = 2 hours + 2 hours = 4 hours

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

Average Speed = Total Distance / Total Time Taken

Average Speed = 280 km / 4 hours = 70 km/h

Therefore, the average speed of the car during the entire journey is 70 km/h.