Question

Из москвы в 6 часов вылетел самолёт в Красноярск со скоростью 600 км/ч.Через час вслед за ним вылетел другой самолёт со скоростью 800км/чВ каком часу воторой самолёт догонит первый?Решить по действиям

Answer 1

1)600×2=1200 (за 2 часа)
2)1200-800=400 (км)
Ответ: за 1 час и 30 минут второй самолет догонит первый.

Answer 2

Problem Analysis

We are given that a plane departs from Moscow to Krasnoyarsk at 6:00 with a speed of 600 km/h. Another plane departs one hour later with a speed of 800 km/h. We need to determine at what time the second plane will catch up to the first plane.

Solution

Let's assume that the time it takes for the second plane to catch up to the first plane is t hours.

During this time, the first plane will have traveled a distance of 600 * t km, and the second plane will have traveled a distance of 800 * (t - 1) km (since it departs one hour later).

To find the time when the second plane catches up to the first plane, we need to solve the equation:

600 * t = 800 * (t - 1)

Simplifying the equation:

600t = 800t - 800

200t = 800

t = 4

Therefore, the second plane will catch up to the first plane after 4 hours.

To find the time when the second plane catches up to the first plane, we add this time to the departure time of the second plane:

6:00 + 4 hours = 10:00

Therefore, the second plane will catch up to the first plane at 10:00.

Answer

The second plane will catch up to the first plane at 10:00.