Question

Автомобиль ехал 1.5 часа со скоростью 40 км/ч , 2.5 часа- со скоростью 60 км/ч , оставшуюся часть пути -со скоростью 75 км/ч. определите среднюю скорость автомобиля, если всего он потратил 5 часов. ответ укажите в км/ч.

Answer 1

1,5*40=60 км проехал за 1,5 часа                                                                              2,5*60=150 км проехал за 2,5 часа                                                                           1,5+2,5=4 часа проехал                                                                                              5-4=1 час остался                                                                                                       1*75=75 км проехал за 1 час                                                                                      60+150+75=285 км проехал за 5 часов                                                                     285:5=57 км/час средняя скорость автомобиля

Answer 2

Problem Analysis

We are given the following information: - The car traveled for 1.5 hours at a speed of 40 km/h. - The car traveled for 2.5 hours at a speed of 60 km/h. - The remaining part of the journey was traveled at a speed of 75 km/h. - The total time taken for the journey was 5 hours.

We need to determine the average speed of the car.

Solution

To find the average speed, we can use the formula:

Average Speed = Total Distance / Total Time

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

Let's calculate the distances traveled at each speed:

- Distance traveled at 40 km/h for 1.5 hours: 40 km/h * 1.5 hours = 60 km - Distance traveled at 60 km/h for 2.5 hours: 60 km/h * 2.5 hours = 150 km - Distance traveled at 75 km/h for the remaining time: Total distance - (60 km + 150 km)

Now, let's calculate the average speed using the formula mentioned above.

Calculation

- Distance traveled at 40 km/h for 1.5 hours: 40 km/h * 1.5 hours = 60 km - Distance traveled at 60 km/h for 2.5 hours: 60 km/h * 2.5 hours = 150 km - Distance traveled at 75 km/h for the remaining time: Total distance - (60 km + 150 km) = Total distance - 210 km

Total distance = 60 km + 150 km + (Total distance - 210 km)

Simplifying the equation, we get:

Total distance = 210 km + Total distance - 210 km

Solving for Total distance, we get:

Total distance = 210 km

Now, let's calculate the average speed:

Average Speed = Total Distance / Total Time = 210 km / 5 hours = 42 km/h

Therefore, the average speed of the car is 42 km/h.

Answer

The average speed of the car is 42 km/h.