Question

Два самолета вылетели одновременно с аэродрома в противоположных направлениях Через 20 минут после вылета расстояние между ними было 540 километров первый летел со скоростью 900 километров в час с какой скоростью летел второй самолет

Answer 1

1)900:3=300км-расстояние,которое пролетел 1 самолет за 20 минут.2) 540-300=240 км -расстояние,которое пролетел 2самолет за 20 минут.3)240*3=720 км/ч-скорость 2 самолета

Answer 2

1)15*30=450(км)-расстояние 1 самолёта.

2)810-450=360(км)-расстояние 2 самолёта.

3)360:30=12(км/мин)-скорость 2 самолёта.

Ответ:12 километров в час.

Answer 3

Problem Analysis

Two planes took off simultaneously from an airfield in opposite directions. After 20 minutes, the distance between them was 540 kilometers. The speed of the first plane is given as 900 kilometers per hour. We need to determine the speed of the second plane.

Solution

Let's assume the speed of the second plane is x kilometers per hour.

To find the speed of the second plane, we can use the formula:

Distance = Speed × Time

The first plane traveled for 20 minutes, which is equal to 20/60 = 1/3 hours.

The distance traveled by the first plane can be calculated as:

Distance1 = Speed1 × Time1

Substituting the given values:

Distance1 = 900 × 1/3

The distance traveled by the second plane can be calculated as:

Distance2 = Speed2 × Time2

Substituting the given values:

Distance2 = x × 1/3

The total distance between the two planes after 20 minutes is given as 540 kilometers. Therefore, we can write the equation:

Distance1 + Distance2 = 540

Substituting the calculated values:

(900 × 1/3) + (x × 1/3) = 540

Simplifying the equation:

300 + x/3 = 540

Multiplying both sides of the equation by 3 to eliminate the fraction:

900 + x = 1620

Subtracting 900 from both sides of the equation:

x = 1620 - 900

Simplifying:

x = 720

Therefore, the speed of the second plane is 720 kilometers per hour.

Answer

The second plane flew with a speed of 720 kilometers per hour.