Question

От одной станции одновременно в противоположных направлениях вышли два поезда через 6 часов расстояние между ними стало 840км найди скорость второго поезда если скорость первого 75км ч

Answer 1

840:6=140 км/час скорость удаления
140-75=65 км/час скорость второго
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Answer 2

1) 840 : 6 =140
2) 140-75 =65 (км / ч ) скорость другого 

Answer 3

Problem Analysis

We are given that two trains start from the same station in opposite directions. After 6 hours, the distance between them is 840 km. We need to find the speed of the second train, given that the speed of the first train is 75 km/h.

Solution

Let's assume the speed of the second train is x km/h.

We know that the distance traveled by a train is equal to the product of its speed and time. Therefore, the distance traveled by the first train in 6 hours is 75 km/h * 6 h = 450 km.

Since the two trains are moving in opposite directions, the total distance between them is the sum of the distances traveled by each train. Therefore, we can write the equation:

Distance traveled by the first train + Distance traveled by the second train = Total distance between the trains

Substituting the values we know, we get:

450 km + Distance traveled by the second train = 840 km

Simplifying the equation, we find:

Distance traveled by the second train = 840 km - 450 km = 390 km

Now, we can use the formula for distance traveled to find the time taken by the second train. The formula is:

Distance = Speed * Time

Rearranging the formula, we get:

Time = Distance / Speed

Substituting the values we know, we get:

Time taken by the second train = 390 km / x km/h

Since the time taken by the second train is 6 hours, we can write the equation:

6 hours = 390 km / x km/h

Simplifying the equation, we find:

x km/h = 390 km / 6 hours

Now, we can calculate the speed of the second train.

Calculation

Let's calculate the speed of the second train using the given values.

x km/h = 390 km / 6 hours

x km/h = 65 km/h

Answer

Therefore, the speed of the second train is 65 km/h.