Question

ОЧЕНЬ СРОЧНО! пожалуйста помогите решить задачи!!Машина преодолевает первые 30 минут пути, имея скорость 50 км/ч. На протяжении следующего часа скорость машины была равна 79 км/ч, а последние полтора часа — 93 км/ч. Определи среднюю скорость автомобиля. Если бы весь путь автомобиль двигался со скоростью 79 км/ч, какое время бы занял весь путь?(Ответы округли до сотых.)средняя скорость:время:Машина преодолевает первые 30 минут пути, имея скорость 55 км/ч. Следующий час скорость машины была равна 72 км/ч, а последние полтора часа — 94 км/ч. Определи среднюю скорость автомобиля. Если бы весь путь автомобиль двигался со скоростью 72 км/ч, какое время бы занял весь путь?Ответы округли до сотых.средняя скорость:время:​

Answer 1

Ответ: средня скорость 80,17 км/ч

Время 3,34 ч

Объяснение:

Answer 2

Task 1: Average Speed and Time Calculation

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

Given the information provided, let's calculate the average speed and time for the first scenario:

- The car travels at a speed of 50 km/h for the first 30 minutes. - The car then travels at a speed of 79 km/h for the next hour. - Finally, the car travels at a speed of 93 km/h for the last 1.5 hours.

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

1. Calculate the distance traveled at each speed: - Distance traveled at 50 km/h for 30 minutes: (50 km/h) x (0.5 h) = 25 km - Distance traveled at 79 km/h for 1 hour: (79 km/h) x (1 h) = 79 km - Distance traveled at 93 km/h for 1.5 hours: (93 km/h) x (1.5 h) = 139.5 km

2. Calculate the total distance traveled: - Total distance traveled = 25 km + 79 km + 139.5 km = 243.5 km

3. Calculate the total time taken: - Total time taken = 30 minutes + 1 hour + 1.5 hours = 3 hours

4. Calculate the average speed: - Average speed = Total distance traveled / Total time taken = 243.5 km / 3 h = 81.17 km/h

Therefore, the average speed of the car is approximately 81.17 km/h for the first scenario.

To calculate the time it would take to travel the entire distance at a constant speed of 79 km/h, we can use the formula:

Time = Distance / Speed

5. Calculate the time it would take to travel the entire distance at a speed of 79 km/h: - Time = 243.5 km / 79 km/h = 3.08 hours

Therefore, if the car traveled the entire distance at a constant speed of 79 km/h, it would take approximately 3.08 hours.

Task 2: Average Speed and Time Calculation

Let's now calculate the average speed and time for the second scenario:

- The car travels at a speed of 55 km/h for the first 30 minutes. - The car then travels at a speed of 72 km/h for the next hour. - Finally, the car travels at a speed of 94 km/h for the last 1.5 hours.

Using the same steps as before:

1. Calculate the distance traveled at each speed: - Distance traveled at 55 km/h for 30 minutes: (55 km/h) x (0.5 h) = 27.5 km - Distance traveled at 72 km/h for 1 hour: (72 km/h) x (1 h) = 72 km - Distance traveled at 94 km/h for 1.5 hours: (94 km/h) x (1.5 h) = 141 km

2. Calculate the total distance traveled: - Total distance traveled = 27.5 km + 72 km + 141 km = 240.5 km

3. Calculate the total time taken: - Total time taken = 30 minutes + 1 hour + 1.5 hours = 3 hours

4. Calculate the average speed: - Average speed = Total distance traveled / Total time taken = 240.5 km / 3 h = 80.17 km/h

Therefore, the average speed of the car is approximately 80.17 km/h for the second scenario.

To calculate the time it would take to travel the entire distance at a constant speed of 72 km/h, we can use the formula:

Time = Distance / Speed

5. Calculate the time it would take to travel the entire distance at a speed of 72 km/h: - Time = 240.5 km / 72 km/h = 3.34 hours

Therefore, if the car traveled the entire distance at a constant speed of 72 km/h, it would take approximately 3.34 hours.

Please note that the answers have been rounded to two decimal places as requested.