Question

Из двух городов, расстояние между которыми 300км, одновременно навстречу друг другу выехали автомобиль со скоростью 80 км/ч и велесипедист со скоростью 20 км/ч. Через сколько времени они встретятся?

Answer 1

1) 20+80=100км/ч скорость сближения автомобилей

2) 300:100=3ч они встретятся

Ответ: они встретятся через 3 часа 

Answer 2

найдем скорость сближения: 80+20 = 100 км/ч

найдем время встречи: 300/100 = 3 ч

через 3 ч они встретятся

Answer 3

Problem Analysis

We are given that two vehicles, a car and a cyclist, start simultaneously from two cities that are 300 km apart. The car has a speed of 80 km/h, while the cyclist has a speed of 20 km/h. We need to determine how long it will take for them to meet.

Solution

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

Let's calculate the time it takes for the car and the cyclist to meet.

1. Time taken by the car: - Distance traveled by the car = 300 km - Speed of the car = 80 km/h - Time taken by the car = 300 km / 80 km/h = 3.75 hours.

2. Time taken by the cyclist: - Distance traveled by the cyclist = 300 km - Speed of the cyclist = 20 km/h - Time taken by the cyclist = 300 km / 20 km/h = 15 hours.

Since the car and the cyclist started simultaneously, they will meet when their total travel time is equal. Therefore, they will meet after 3.75 hours.

Answer

The car and the cyclist will meet after approximately 3.75 hours.

Please note that the above calculations assume constant speeds for both the car and the cyclist throughout their journey.