Question

Машина ехала 2 часа со скоростью 45км/ч и 3 часа со скоростью 40км/ч.найдите среднюю скорость машины за это время

Answer 1

2*45=90 км прошла за 2 часа
3*40=120 км прошла за 3 часа
90+120=210 км весь путь
2+3=5 часов на весь путь
210:5=42 км/час средняя скорость
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Answer 2

2*45=90
40*3=120
120+90=210
2ч+3ч=5ч
210:5=42

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 for 2 hours at a speed of 45 km/h. - The car traveled for 3 hours at a speed of 40 km/h.

To find the total distance traveled, we can add the distances traveled at each speed: - Distance traveled at 45 km/h for 2 hours: 45 km/h * 2 hours = 90 km - Distance traveled at 40 km/h for 3 hours: 40 km/h * 3 hours = 120 km

The total distance traveled is 90 km + 120 km = 210 km.

To find the total time taken, we can add the times taken at each speed: - Time taken at 45 km/h for 2 hours: 2 hours - Time taken at 40 km/h for 3 hours: 3 hours

The total time taken is 2 hours + 3 hours = 5 hours.

Now, we can calculate the average speed by dividing the total distance traveled by the total time taken: Average speed = Total distance / Total time = 210 km / 5 hours = 42 km/h.

Therefore, the average speed of the car during this time period is 42 km/h.