Question

Поезд путь от одной станции до другой прошёл за 3,5 ч со скоростью 70 км/ч. С какой скоростью должен был идти поезд, чтобы пройти этот путь за 4,9ч?

Answer 1

Ответ:

50 км/ч

Пошаговое объяснение:

Расстояние между станциями:

S=vt=70*3.5=245км

Тогда необходимая скорость:

v=S/t=245/4.9=50км/ч

Answer 2

Problem Analysis

We are given that a train traveled from one station to another in 3.5 hours at a speed of 70 km/h. We need to find the speed at which the train should have traveled to cover the same distance in 4.9 hours.

Solution

To find the speed at which the train should have traveled, we can use the formula:

Speed = Distance / Time

Let's calculate the distance traveled by the train using the given time and speed.

Given: - Time taken = 3.5 hours - Speed = 70 km/h

Using the formula, we can calculate the distance:

Distance = Speed * Time

Distance = 70 km/h * 3.5 hours

Distance = 245 km

Now, we need to find the speed at which the train should have traveled to cover the same distance in 4.9 hours.

Let's use the formula again:

Speed = Distance / Time

Given: - Distance = 245 km - Time = 4.9 hours

Using the formula, we can calculate the speed:

Speed = 245 km / 4.9 hours

Speed = 50 km/h

Therefore, the train should have traveled at a speed of 50 km/h to cover the same distance in 4.9 hours.

Answer

The train should have traveled at a speed of 50 km/h to cover the same distance in 4.9 hours.