Question

Собака гонится за зайцем со скоростью 4 м/с., а заяц убегает от нее со скоростью 5м/с. Какое расстояние будет между ними через 20 сек, если сейчас расстояние между ними 20 метров?

Answer 1

5*20=100 м - за 20 секунд.
4*20=80 м - за 20 секунд.
100-80=20 м - расстояние между зайцем и собакой.
 расстояние между ними через 20 секунд будет-20+20=40 м 
Ответ: 40 м.

Answer 2

5*20=100 м - пробежит заяц за 20 секунд.
4*20=80 м - пробежит собака за 20 секунд.
100-80=20 м - на столько увеличится расстояние между зайцем и собакой.
20+20=40 м - будет расстояние между ними через 20 секунд.
Ответ: 40 м.

Answer 3

Calculation of Distance between the Dog and the Hare

To calculate the distance between the dog and the hare after 20 seconds, we need to consider their relative speeds and the initial distance between them.

Given: - The dog is chasing the hare with a speed of 4 m/s. - The hare is running away from the dog with a speed of 5 m/s. - The initial distance between them is 20 meters.

To find the distance between them after 20 seconds, we can use the formula:

Distance = Initial Distance + (Relative Speed × Time)

Let's calculate the distance:

Initial Distance = 20 meters Relative Speed = Speed of the Hare - Speed of the Dog = 5 m/s - 4 m/s = 1 m/s Time = 20 seconds

Distance = 20 meters + (1 m/s × 20 seconds) = 20 meters + 20 meters = 40 meters

Therefore, the distance between the dog and the hare after 20 seconds will be 40 meters.

Please note that the above calculation assumes constant speeds for both the dog and the hare, and a straight-line pursuit. In reality, the speeds of animals can vary, and the pursuit may involve changes in direction and acceleration.