Question

Скорость товарного поезда 40км/ч меньше скорости пассажирского. Товарный поезд за 7 ч проходит такой же путь , как пассажирский за 4.2 ч . Найдите скорость товарного поезда

Answer 1

Скорость пассажирского - х, а товарного - х-40 решение: 4,2 • х=7•(х-40) 4,2•х=7•х-280 2,8х=280 х=100км\ч 100-40=60км\ч-скорость товарного поезда

Answer 2

Calculating the Speed of the Freight Train

To find the speed of the freight train, we can use the formula: speed = distance / time

Given: - Speed of the freight train = 40 km/h - Time taken by the freight train = 7 hours - Time taken by the passenger train = 4.2 hours

We can use the fact that the distance covered by both trains is the same.

Calculation

Let's assume the distance covered by both trains is d.

For the freight train: speed = d / 7

For the passenger train: speed = d / 4.2

Since the distance is the same for both trains, we can equate the two expressions: d / 7 = d / 4.2

Solving for d: d = 7 * 40 = 280 km

Now that we have the distance, we can find the speed of the freight train: speed = distance / time = 280 km / 7 hours = 40 km/h

So, the speed of the freight train is 40 km/h.