Question

Товарный поезд за 7ч проходит такой же путь , что пассажирский за 4,2ч.Найдите скорость товарного поезда, если его скорость на 36км/ч меньше скорости пассажирского

Answer 1

1)7*36=252
2)252:4,2=60

Answer 2

Calculating the Speed of the Freight Train

To find the speed of the freight train, we can use the formula: distance = speed × time. Given that the freight train covers the same distance as the passenger train but takes 7 hours, while the passenger train takes 4.2 hours, and the freight train's speed is 36 km/h less than the passenger train's speed, we can calculate the speed of the freight train.

Let's denote: - Speed of the passenger train as v km/h - Speed of the freight train as v - 36 km/h - Time taken by the passenger train as 4.2 hours - Time taken by the freight train as 7 hours

Using the formula distance = speed × time, we can set up the equation: v × 4.2 = (v - 36) × 7

Solving for v will give us the speed of the passenger train, and then we can find the speed of the freight train.

Calculation

Using the given equation v × 4.2 = (v - 36) × 7, we can solve for v:

4.2v = 7v - 252 252 = 7v - 4.2v 252 = 2.8v v = 252 / 2.8 v = 90

So, the speed of the passenger train (v) is 90 km/h.

Now, we can find the speed of the freight train: Speed of the freight train = 90 - 36 Speed of the freight train = 54 km/h

Therefore, the speed of the freight train is 54 km/h.