Between points A and B, the distance is 360 km. A car drove out of point A at a speed of 70 km / h.

| June 22, 2021 | education

Between points A and B, the distance is 360 km. A car drove out of point A at a speed of 70 km / h. After 3 hours, a car left point B at a speed of 75 km / h. How long will it take between them 2 km.

1. It is known that a car left A at a speed of 70 km / h.

Until the start of the second car, it moved for 3 hours.

Let’s determine how far he traveled during this time.

70 * 3 = 210 km.

2. According to the condition of the problem, the distance between points A and B is 360 km.

Let’s find the distance between the cars at the start of the second one.

360 – 210 = 150 km.

3. The speed of the second car is 75 km / h.

Let’s calculate the speed of joint movement.

70 + 75 = 145 km / h.

4. By condition, the distance between cars should be 2 km.

This means that they must travel 150 – 2 = 148 km.

5. Let’s calculate the time of movement.

148/145 = 1.02 hours

Answer: After about 1.02 hours, the distance between the cars will be 2 km.



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