Question

Два самолета вылетели с аэродрома в одно и тоже время в противоположных направлениях.Через 10 мин после вылета расстояние между ними было 270 км.Первый самолёт летел со средней скоростью 15 км /мин. С какой средней скоростью летел второй самолёт?

Answer 1

1) 15*10=150 км пролетел первый самолет за 10 минут

2) 270-150=120 км пролетел второй самолет

3) 120:10=12 км/ч средняя скорость второго самолета

Answer 2

1)270:10=27(км.мин)- общая средняя скорость двух самолетов 

2)27-15=12(км.мин) - средняя  скорость второго самолета

Answer 3

Problem Analysis

Two planes took off from an airport at the same time in opposite directions. After 10 minutes, the distance between them was 270 km. The first plane flew at an average speed of 15 km/min. We need to find the average speed of the second plane.

Solution

Let's assume the average speed of the second plane is x km/min.

After 10 minutes, the first plane would have covered a distance of 10 minutes * 15 km/min = 150 km.

Since the total distance between the two planes is 270 km, the second plane must have covered a distance of 270 km - 150 km = 120 km in 10 minutes.

Therefore, the average speed of the second plane is 120 km / 10 minutes = 12 km/min.

Answer

The second plane flew at an average speed of 12 km/min.