Question

Из двух городов навстречу друг другу вышли одновременно два поезда. Скорость одного из них 75,5 км/ч, а скорость другого 82,5 км/ч. Через сколько часов они встретятся, если расстояние между городами 663,6 км?

Answer 1

1)  75,5 + 82,5 = 158 (км/ч) - скорость сближения поездов;
2)  663,6 : 158 = 4,2 (ч)  ((или 4 часа 12 минут).

ответ: поезда встретятся через 4 ч12мин.

Answer 2

663,6 : ( 75,5 + 82,5 ) = 663,6 : 158 = 4,2 ( часа )
Ответ через 4,2 часа

Answer 3

Problem Analysis

We have two trains traveling towards each other from two different cities. The speed of one train is 75.5 km/h, and the speed of the other train is 82.5 km/h. We need to determine how many hours it will take for the trains to meet if the distance between the cities is 663.6 km.

Calculation

To solve this problem, we can use the formula: time = distance / relative speed.

The relative speed of the two trains is the sum of their individual speeds, as they are traveling towards each other. So, the relative speed is 75.5 km/h + 82.5 km/h = 158 km/h.

Now, we can calculate the time it will take for the trains to meet by dividing the distance between the cities by the relative speed:

time = 663.6 km / 158 km/h

Let's calculate the result.

Calculation Result

The time it will take for the trains to meet is approximately 4.2 hours.

Conclusion

The two trains will meet approximately 4.2 hours after they start traveling towards each other.

Please let me know if there's anything else I can help you with!