Question

Из одного гнезда одновременно вылетели в противоположных направлениях две вороны.Через 0,15ч между ними было 7,8км.Найдите скорость второй вороны 32,8км/ч.Найдите скорость второй вороны

Answer 1

7,8=0,15*(х+32,8)
52=х+32,8
х=52-32,8
х=19,2

Ответ: 19,2 км/ч

Answer 2

Problem Analysis

We are given that two crows flew out of the same nest in opposite directions. After 0.15 hours, they were 7.8 km apart. We are asked to find the speed of the second crow, which is given as 32.8 km/h.

Solution

Let's assume the speed of the first crow is v1 km/h and the speed of the second crow is v2 km/h.

We know that the distance covered by an object is equal to its speed multiplied by the time taken. Therefore, the distance covered by the first crow in 0.15 hours is 0.15 * v1 km, and the distance covered by the second crow in 0.15 hours is 0.15 * v2 km.

Since the crows flew in opposite directions, the total distance between them is the sum of the distances covered by each crow. Therefore, we have the equation:

0.15 * v1 + 0.15 * v2 = 7.8 km

We are given that the speed of the second crow, v2, is 32.8 km/h. Substituting this value into the equation, we can solve for v1.

0.15 * v1 + 0.15 * 32.8 = 7.8

Simplifying the equation:

0.15 * v1 + 4.92 = 7.8

0.15 * v1 = 7.8 - 4.92

0.15 * v1 = 2.88

Dividing both sides of the equation by 0.15:

v1 = 2.88 / 0.15

v1 = 19.2 km/h

Therefore, the speed of the first crow, v1, is 19.2 km/h.

Answer

The speed of the second crow is 32.8 km/h.