Question

Две стрекозы вылетели одновременно в протваположных направлениях с одного листочка.Скорость первой стрекозы-15м/с(метров в секунду),второй-13м/с(метров секунду)Какое растояние будет межу ними через 30секунд?

Answer 1

15×30=450м/с
13×30=390м/с
450+390=840м
Ответ:840метров

Answer 2

Calculation of Distance Between Two Dragonflies

To calculate the distance between two dragonflies that flew in opposite directions from the same leaf, we need to consider their speeds and the time elapsed.

Given: - Speed of the first dragonfly: 15 m/s - Speed of the second dragonfly: 13 m/s - Time elapsed: 30 seconds

To calculate the distance between them, we can use the formula:

Distance = Speed × Time

For the first dragonfly: Distance covered by the first dragonfly = Speed of the first dragonfly × Time elapsed Distance covered by the first dragonfly = 15 m/s × 30 s

For the second dragonfly: Distance covered by the second dragonfly = Speed of the second dragonfly × Time elapsed Distance covered by the second dragonfly = 13 m/s × 30 s

To find the distance between them, we subtract the distance covered by the second dragonfly from the distance covered by the first dragonfly:

Distance between the dragonflies = Distance covered by the first dragonfly - Distance covered by the second dragonfly

Let's calculate the distances:

Distance covered by the first dragonfly = 15 m/s × 30 s = 450 metersDistance covered by the second dragonfly = 13 m/s × 30 s = 390 meters Distance between the dragonflies = 450 meters - 390 meters = 60 meters

Therefore, the distance between the two dragonflies after 30 seconds will be 60 meters.

Please note that the above calculation assumes that the dragonflies maintain a constant speed throughout the 30-second duration.