Question

С аэродрома вылетели в одно и то же время в противоположных направлениях два самолёта. Через 3 часа расстояние между ними было 30 630км. Один из них летел со скоростью 640 км/ч. С какой скоростью летел другой самолёт?

Answer 1

$640*3 = 1920$ км - путь,  который за три часа проделал первый самолет
$3600 - 1920 = 1680$ км - путь, проделанный вторым самолетом
$1680:3 = 560$ км/ч - скорость второго самолета 

Answer 2

1) 640 * 3 = 1920 (км) пролетел один самолёт за 3 часа
2) 3600 - 1920 = 1680 (км) пролетел другой самолёт за 3 часа
3) 1680 : 3 = 560 (км/ч)
Ответ: 560 км/ч - скорость другого самолёта

Answer 3

Problem Analysis

Two planes took off from the same airport at the same time in opposite directions. After 3 hours, the distance between them was 30,630 km. One of the planes was flying at a speed of 640 km/h. We need to find the speed of the other plane.

Solution

Let's assume the speed of the other plane is x km/h.

After 3 hours, the first plane would have traveled a distance of 640 * 3 = 1920 km.

The second plane would have also traveled a distance of x * 3 km.

The total distance between the two planes after 3 hours is the sum of the distances traveled by each plane:

1920 + x * 3 = 30,630

To find the value of x, we can solve this equation:

x * 3 = 30,630 - 1920

x * 3 = 28,710

x = 28,710 / 3

x = 9570 km/h

Therefore, the other plane was flying at a speed of 9570 km/h.

Answer

The other plane was flying at a speed of 9570 km/h.