Question

С двух станций , расстояние между которыми 720 км, вышли одновременно навстречу друг другу два поезда. Скорость первого поезда 75 км/ч, а скорость второго на 10 км/ч больше. На каком расстоянии друг от друга будут поезда через 4 часа?

Answer 1

1) 75+10=85(км/час) -скор 2го                                                                            2) 75 *4= 300(км) - проехал1й                                                                             3) 85*4=340(км) - проехал 2й                                                                            4) 300 + 340= 640(км) - проехали оба                                                                %) 720-640 80(км) - расстояние между ними

Answer 2

Problem Analysis

We have two trains traveling towards each other from two different stations. The distance between the stations is 720 km. The first train is traveling at a speed of 75 km/h, while the second train is traveling at a speed 10 km/h faster than the first train. We need to determine the distance between the trains after 4 hours.

Solution

To find the distance between the trains after 4 hours, we need to calculate the total distance covered by both trains in 4 hours and subtract it from the initial distance of 720 km.

Let's calculate the distance covered by each train in 4 hours.

The distance covered by the first train in 4 hours can be calculated using the formula:

Distance = Speed x Time

For the first train: - Speed = 75 km/h - Time = 4 hours

Distance covered by the first train = 75 km/h x 4 hours = 300 km.

The speed of the second train is 10 km/h faster than the first train, so the speed of the second train is 75 km/h + 10 km/h = 85 km/h.

Using the same formula, we can calculate the distance covered by the second train in 4 hours:

Distance covered by the second train = 85 km/h x 4 hours = 340 km.

Now, let's calculate the distance between the trains after 4 hours:

Distance between the trains = Initial distance - (Distance covered by the first train + Distance covered by the second train).

Distance between the trains = 720 km - (300 km + 340 km) = 720 km - 640 km = 80 km.

Therefore, the distance between the trains after 4 hours will be 80 km.

Answer

The distance between the two trains after 4 hours will be 80 km.