Question

Поезд проехал 400км со скоростью 50км/ч, а на обратном пути это расстояние он проехал в 2 раза быстрее. За сколько часов проехал это расстояние поезд на обратном пути?

Answer 1

1) 400 : 50 = 8 (ч) проехал поезд путь в одну сторону.
2) 8 : 2 = 4 (ч) потратил поезд на обратный путь
              Ответ: 4 часа.

Answer 2

Problem Analysis

We are given that a train traveled a distance of 400 km at a speed of 50 km/h. On the return journey, the train traveled the same distance at a speed twice as fast. We need to determine how many hours it took for the train to travel this distance on the return journey.

Solution

Let's calculate the time it took for the train to travel the distance on the outbound journey and then use that information to find the time for the return journey.

The formula to calculate time is:

Time = Distance / Speed

For the outbound journey: - Distance = 400 km - Speed = 50 km/h

Substituting these values into the formula, we get:

Time_outbound = 400 km / 50 km/h

Simplifying the expression, we find:

Time_outbound = 8 hours Since the train traveled the same distance on the return journey, we can use the time it took for the outbound journey to determine the time for the return journey. We are given that the train traveled at twice the speed on the return journey, so the speed for the return journey is:

Speed_return = 2 * Speed_outbound = 2 * 50 km/h = 100 km/h

Using the formula for time again, we can calculate the time for the return journey:

Time_return = Distance / Speed_return = 400 km / 100 km/h

Simplifying the expression, we find:

Time_return = 4 hours

Therefore, it took the train 4 hours to travel the distance on the return journey.

Answer

The train took 4 hours to travel the distance on the return journey.