Question

Автомобиль проехал 3 ч со скоростью 75 км/к, следующие 2 часа он снизил скорость на 12 км/ч, а в последующие 4 ч увеличил скорость до 80 км/ч. какое расстояние проехал автомобиль за все время

Answer 1

75*3+63*2+80*4=225+126+320=683(км)
Ответ: 683км.

Answer 2

Calculating the Distance Traveled by the Car

To calculate the total distance traveled by the car, we can break down the journey into three segments: the first 3 hours, the next 2 hours, and the final 4 hours.

1. First 3 Hours at 75 km/h: - Distance = Speed × Time - Distance = 75 km/h × 3 h - Distance = 225 km - The car traveled 225 km in the first 3 hours.

2. Next 2 Hours at Reduced Speed: - The car reduced its speed by 12 km/h from the initial 75 km/h. - The distance traveled during this time can be calculated using the formula: Distance = Speed × Time. - Distance = (75 km/h - 12 km/h) × 2 h - Distance = 63 km/h × 2 h - Distance = 126 km - The car traveled 126 km in the next 2 hours.

3. Final 4 Hours at 80 km/h: - The car increased its speed to 80 km/h for the last 4 hours. - The distance traveled during this time can be calculated using the formula: Distance = Speed × Time. - Distance = 80 km/h × 4 h - Distance = 320 km - The car traveled 320 km in the final 4 hours.

Total Distance Traveled

To find the total distance traveled by the car, we can sum the distances traveled in each segment: - Total Distance = 225 km + 126 km + 320 km - Total Distance = 671 km

Therefore, the car traveled a total distance of 671 kilometers during the entire journey.