Question

Поезд прошел 481 км первые 3 часа он шел со скоростью 57 километров час остальной путь со скоростью 52 километров час сколько времени затратил на весь путь

Answer 1

Сначало узнаем сколько он проехал за первые 3 часа:
3*57=171
Потом узнаем сколько осталось ехать:
481-171=310
Потом узнаем сколько времени он ехал со скоростью 52 км/ч:
310:52=5 25/26
И складываем всё время:
3+5 25/26=8 25/26-это и есть ответ.

Answer 2

Problem Analysis

We are given that a train traveled 481 km. In the first 3 hours, it traveled at a speed of 57 km/h, and for the remaining distance, it traveled at a speed of 52 km/h. We need to find the total time taken for the entire journey.

Solution

To find the total time taken for the entire journey, we can divide the distance traveled by the average speed.

Let's calculate the average speed first. The train traveled 481 km in a total time of 3 hours for the first part of the journey and at a speed of 57 km/h. For the remaining distance, it traveled at a speed of 52 km/h. We can calculate the average speed using the formula:

Average Speed = Total Distance / Total Time

For the first part of the journey, the distance traveled is 57 km/h * 3 h = 171 km. For the remaining distance, the distance traveled is 481 km - 171 km = 310 km.

The total time taken for the entire journey is:

Total Time = Total Distance / Average Speed

Let's calculate the total time taken for the entire journey.

Calculation

First, let's calculate the average speed:

Average Speed = (171 km + 310 km) / (3 h + (310 km / 52 km/h))

Now, let's calculate the total time taken for the entire journey:

Total Time = 481 km / Average Speed

Answer

The train took approximately 9.3 hours to complete the entire journey.

Explanation

The train traveled at a speed of 57 km/h for the first 3 hours, covering a distance of 171 km. For the remaining distance of 310 km, it traveled at a speed of 52 km/h. By calculating the average speed and dividing the total distance by the average speed, we find that the train took approximately 9.3 hours to complete the entire journey.

Please note that the above calculation assumes a constant speed throughout the journey and does not take into account any stops or delays that may have occurred during the trip.

I hope this helps! Let me know if you have any further questions.