Question

Из места А в место В на машине доехали за 8 часов.Автомобиль двигался со скоростью 63 км/ч.На сколько км/ч нужно увеличить скорость автомобиля,чтобы на обратный путь потратить 7 часов?

Answer 1

63*8=504 км  расстояние от А до В
504:7=72 км/ч скорость за 7 часов
72-63=9 км/ч  

Answer 2

63:7=9км ч на столько больше нужно увеличить скорость автомобиля.

ответ 9км ч

Answer 3

Calculation of Speed Increase

To calculate the required increase in speed for the return journey, we can use the formula:

Speed = Distance / Time

Given that the distance from point A to point B was covered in 8 hours at a speed of 63 km/h, we can calculate the distance using the formula:

Distance = Speed * Time

Let's calculate the distance first:

Distance = 63 km/h * 8 hours = 504 km.

To find the required increase in speed for the return journey, we need to determine the time taken for the return journey. We are given that the time for the return journey is 7 hours.

Using the formula for distance:

Distance = Speed * Time

We can rearrange the formula to solve for speed:

Speed = Distance / Time

Substituting the values:

Speed = 504 km / 7 hours = 72 km/h

Therefore, the speed of the car needs to be increased by 9 km/h to complete the return journey in 7 hours.

Please note that these calculations assume a constant speed throughout the journey and do not take into account factors such as traffic or road conditions.