Question

Помогите сейчас пожалуйста !!! Из пунктов А и Б одновременно навстречу друг другу выехал велосипедист и вышел пешеход.Через какое время они встретятся,если велосипедисту на весь путь требуется 40 мин,а пешеходу 2 часа?

Answer 1

1- весь путь
40 мин=40/60=4/6=2/3 часа

1: 2/3=1*3/2=1,5- скорость вело
1:2=0,5- скорость пешехода

1,5+0,5=2 скорость сближения

1/2=0,5ч=30мин- время, через которое они встретятся

Answer 2

Problem Analysis

We are given that a cyclist and a pedestrian start simultaneously from points A and B, respectively, and are moving towards each other. We need to determine the time it takes for them to meet if the cyclist takes 40 minutes to cover the entire distance and the pedestrian takes 2 hours.

Solution

To solve this problem, we can use the concept of relative speed. The relative speed between the cyclist and the pedestrian is the sum of their individual speeds. We can calculate the relative speed and then use it to find the time it takes for them to meet.

Let's denote the speed of the cyclist as v_c and the speed of the pedestrian as v_p. The relative speed, v_rel, is given by:

v_rel = v_c + v_p

We are given that the cyclist takes 40 minutes to cover the entire distance, which is equivalent to 40/60 = 2/3 hours. Therefore, we can calculate the speed of the cyclist as:

v_c = distance / time = 1 / (2/3) = 3/2 km/h

Similarly, we are given that the pedestrian takes 2 hours to cover the entire distance. Therefore, we can calculate the speed of the pedestrian as:

v_p = distance / time = 1 / 2 = 1/2 km/h

Now, we can calculate the relative speed:

v_rel = v_c + v_p = 3/2 + 1/2 = 2 km/h

To find the time it takes for them to meet, we can use the formula:

time = distance / speed

Since the distance covered by both the cyclist and the pedestrian is the same, we can set up the equation:

distance = speed * time

Substituting the values, we have:

1 = 2 * time

Simplifying, we find:

time = 1/2 hour = 30 minutes

Therefore, the cyclist and the pedestrian will meet after 30 minutes.

Answer

The cyclist and the pedestrian will meet after 30 minutes.