Question

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

Answer 1

Примем

t1=3.5 час

t2=4.9 час

V1=70 км/час

V2=Х км/час

S1=S2=S

Тогда

S1=t1*V1=3.5*70=245 км

S2=t2*V2=245 км

4,9*V2=245

V2=245/4.9=50 км/час

Ответ:

Поезд должен идти со скоростью 50 км/час

Answer 2

Находишь расстояние, которое поезд прошел за 3,5 ч.

S=vt=70*3.5=245км.

Чтобы найти скорость делишь известное расстояние на время

v=$\frac{S}{t}$=$\frac{245}{4.9}$=50км/ч

Answer 3

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 determine the speed at which the train should have traveled in order 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 assume the distance between the two stations is D.

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

Using the formula, we can write:

70 = D / 3.5

Simplifying the equation, we find:

D = 70 * 3.5

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 assume this speed is S.

Given: - Time taken = 4.9 hours - Distance = D (calculated above)

Using the formula, we can write:

S = D / 4.9

Substituting the value of D, we have:

S = (70 * 3.5) / 4.9

Simplifying the equation, we find:

S = 50

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

Answer

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