Question

Автомобиль ехал 10 мин. и за каждую минуту проезжал 900 м, потом сделал остановку, а потом ехал несколько минут, проезжая за каждую минуту 800 м. Всего он проехал расстояние, равное 13 км. За сколько минут он проехал путь после остановки?

Answer 1

900*10=9000 м - проехал за 10 мин
Пусть потом он ехал х минут, тогда за х минут он проехал 800х метров.
13 км=13000м
Составляем уравнение:
9000+800х=13000 
800х=13000-9000
800х=4000
х=4000:800
х=5
Значит, после остановки он ехал 5 минут и проехал рассояние 800*5=4000 метров.
Проверка: 9000+4000=13000 метров=13км.

Answer 2

За 5 минут. Путь до остановки равен 9000м=9км, значит путь после 13000-9000=4000м. А время второй половины пути равно 4000/800=5 минут

Answer 3

Problem Analysis

We are given the information that a car traveled for 10 minutes and covered a distance of 900 meters per minute. Then it made a stop and resumed traveling for several minutes, covering a distance of 800 meters per minute. The total distance traveled is 13 km. We need to determine how many minutes the car traveled after the stop.

Solution

To solve this problem, we can break it down into two parts: the distance covered before the stop and the distance covered after the stop.

Let's calculate the distance covered before the stop: - The car traveled for 10 minutes at a speed of 900 meters per minute. - Therefore, the distance covered before the stop is 10 minutes * 900 meters/minute = 9000 meters.

Now, let's calculate the distance covered after the stop: - The total distance traveled is 13 km, which is equal to 13,000 meters. - Subtracting the distance covered before the stop (9000 meters) from the total distance gives us the distance covered after the stop: 13,000 meters - 9000 meters = 4000 meters.

To find the time taken to cover this distance, we can use the formula: time = distance / speed. - The speed after the stop is 800 meters per minute. - Therefore, the time taken to cover the distance after the stop is 4000 meters / 800 meters/minute = 5 minutes.

Answer

The car traveled for 5 minutes after the stop.