Question

Два автобуса вышли в разное время навстречу друг другу Из двух городов расстояние между которыми 480 километров в час скорость первого автобуса 52 километров скорость второго 42 километров в час пройдя 312 километров 1 автобус встретился со старым на сколько часов 1 автобус вышел раньше 2

Answer 1

1.480-312=168(км)-прошел до встречи второй автобус
2.168:42=4(ч.)-бил в пути 2 автобус
3.312:52=6(ч.)-бил в пути 1 автобус
4.6-4=2(ч.)
Ответ:1 автобус вишел раньше второго на 2 часа

Answer 2

Problem Analysis

We have two buses that start from different cities and are traveling towards each other. The distance between the cities is 480 kilometers. The first bus has a speed of 52 kilometers per hour, and the second bus has a speed of 42 kilometers per hour. We need to determine how many hours the first bus left before the second bus and how long it took for the first bus to meet an old friend.

Solution

To solve this problem, we can use the formula: time = distance / speed.

Let's calculate the time it takes for each bus to travel a certain distance.

The first bus travels a distance of 312 kilometers, so the time it takes for the first bus to travel this distance is: time1 = distance1 / speed1 = 312 km / 52 km/h.

The second bus travels the remaining distance of 480 - 312 = 168 kilometers, so the time it takes for the second bus to travel this distance is: time2 = distance2 / speed2 = 168 km / 42 km/h.

Now, let's calculate the time it took for the first bus to meet its old friend. Since the two buses are traveling towards each other, the total time it took for them to meet is the sum of time1 and time2: total_time = time1 + time2.

To find out how many hours the first bus left before the second bus, we can subtract time2 from time1: time_difference = time1 - time2.

Let's calculate the values:

Calculation

- time1 = 312 km / 52 km/h = 6 hours - time2 = 168 km / 42 km/h = 4 hours - total_time = time1 + time2 = 6 hours + 4 hours = 10 hours - time_difference = time1 - time2 = 6 hours - 4 hours = 2 hours

Answer

Therefore, the first bus left 2 hours before the second bus, and it took 10 hours for the first bus to meet its old friend.

Please let me know if there's anything else I can help you with!