Question

Два поезда выехали одновременно в одном направлении из двух городов,расстояние между которыми 180 км.Скорость первого поезда 80 км/ч,а скорость второго-65 км/ч.Через сколько часов первый поезд догонит второй?

Answer 1

1) 80+65=145 (км/ч)- скорость сближения. 2)180:145=1,24138(ч.)- они встретятся.

Answer 2

Problem Analysis

We are given two trains that start simultaneously from two different cities and are traveling in the same direction. The distance between the two cities is 180 km. The speed of the first train is 80 km/h, and the speed of the second train is 65 km/h. We need to determine how many hours it will take for the first train to catch up to the second train.

Solution

To solve this problem, we can use the formula:

Time = Distance / Speed

Let's calculate the time it will take for the first train to catch up to the second train.

Calculation

The distance between the two cities is 180 km.

The speed of the first train is 80 km/h, and the speed of the second train is 65 km/h.

Let's calculate the time it will take for the first train to catch up to the second train:

Time = Distance / Speed

For the first train: Time = 180 km / 80 km/h = 2.25 hours

For the second train: Time = 180 km / 65 km/h = 2.77 hours

Since the first train is traveling at a faster speed, it will take less time to catch up to the second train.

Therefore, the first train will catch up to the second train in approximately 2.25 hours.

Answer

The first train will catch up to the second train in approximately 2.25 hours.

Please let me know if there is anything else I can help you with.