Question

Поезд прошёл485 км .Первые 2 часа он ехал со скоростью 55км /ч ,а потом со скоростью 75км/ч. Сколько времени он затратил на весь путь?

Answer 1

1) 55х2=110 (км) - прошёл поезд за 2 часа
2) 485-110=375 (км) - осталось пройти
3) 375:75=5 (ч) - пройдёт 375 км
4) 2+5=7 (ч)
Ответ: 7 часов он затратил на весь путь.

Answer 2

1) 55 км/ч · 2ч = 110км - проехал поезд за 2 часа
2) 485км - 110км = 375км - поезд ехал со скоростью 75км/ч
3) 375км : 75км/ч = 5ч - поезд ехал со скоростью 75км/ч
4) 2ч + 5ч = 7ч - поезд затратил на весь путь
Ответ: 7часов

Answer 3

Calculation of Time Taken

To calculate the time taken for the entire journey, we need to determine the time taken for each segment of the journey and then add them together.

The train traveled a total distance of 485 km. In the first 2 hours, it traveled at a speed of 55 km/h, and then it traveled at a speed of 75 km/h.

To calculate the time taken for the first segment, we can use the formula:

Time = Distance / Speed

For the first segment: Distance = 55 km/h * 2 h = 110 km

Time taken for the first segment = 110 km / 55 km/h = 2 hours

To calculate the time taken for the second segment, we can use the same formula:

For the second segment: Distance = 75 km/h * (485 km - 110 km) / 75 km/h = 375 km

Time taken for the second segment = 375 km / 75 km/h = 5 hours

Now, we can add the time taken for both segments to find the total time taken for the entire journey:

Total time taken = Time taken for the first segment + Time taken for the second segment = 2 hours + 5 hours = 7 hours

Therefore, the train took a total of 7 hours for the entire journey.