Question

из города А в город B вышел автобус со скоростью 50 км ч через 4 часа из города B ему на встречу вышел автомобиль со скоростью 80 км ч .Через сколько часов после выхода автомобиля они встретятся,если расстояние между городами 720 км

Answer 1

1. 50*4=200

2. 720-200=520

3. 50+80=130(общая скорость)

4. 520:130=4

ответ: через 4 часа

Answer 2

Problem Analysis

We are given that a bus is traveling from city A to city B at a speed of 50 km/h. After 4 hours, a car starts from city B and travels towards city A at a speed of 80 km/h. We need to determine how many hours it will take for the bus and the car to meet, given that the distance between the cities is 720 km.

Solution

To solve this problem, we can use the formula:

Time = Distance / Speed

Let's calculate the time it takes for the bus to reach the meeting point:

Time taken by the bus = Distance / Speed = 720 km / 50 km/h = 14.4 hours.

Since the car starts 4 hours after the bus, we subtract 4 hours from the time taken by the bus to find the time it takes for the car to reach the meeting point:

Time taken by the car = Time taken by the bus - 4 hours = 14.4 hours - 4 hours = 10.4 hours.

Therefore, it will take the car approximately 10.4 hours to reach the meeting point after it starts from city B.

Answer

The car and the bus will meet approximately 10.4 hours after the car starts from city B.

Note: The answer is approximate because we are assuming constant speeds for both the car and the bus, and we are not considering factors such as acceleration, deceleration, or traffic conditions.