Question

Составьте задачу по рисунку 3.10.Какова скорость собаки,догнавшей мальчика через 27 секунд? Скорость мальчика—70 м/мин. Расстояние 108 метров

Answer 1

Скорость собаки-скорость мальчика=скорость сближения
Скорость собаки=скорость сближения+скорость мальчика
108:27/60=108*60/27=4*60=240м/мин- скорость сближения
скорость собаки=240+70=310м/мин

Answer 2

Problem:

A dog chases after a boy. The boy is running at a speed of 70 m/min. The distance between the dog and the boy is 108 meters. After 27 seconds, the dog catches up to the boy. What is the speed of the dog?

Solution:

To find the speed of the dog, we can use the formula:

Speed = Distance / Time

Given: - Distance = 108 meters - Time = 27 seconds - Boy's speed = 70 m/min

First, we need to convert the boy's speed from m/min to m/s. Since 1 minute is equal to 60 seconds, we can divide the boy's speed by 60 to get the speed in m/s:

Boy's speed = 70 m/min ÷ 60 = 1.17 m/s

Now, we can calculate the speed of the dog using the formula:

Speed of the dog = Distance / Time

Speed of the dog = 108 meters / 27 seconds = 4 m/s

Therefore, the speed of the dog is 4 m/s.