Question

Скорый поезд проехал 660 км. До первой остановки он проехал 6 ч со скоростью 80 км/ч. За какое время поезд преодолел остаток пути, если двигался со скоростью 90 км/ч?

Answer 1

1)80х6=480км-проехал поезд до 1 остановки
2)660-480=180км ему осталось проехать
3)180:90=2ч-за это время поезд проехал остаток пути

Answer 2

80×6=480(км)
660-480=180(км)
180:90=2(ч)
Ответ:За 2 часа

Answer 3

Problem Analysis

We are given that a fast train traveled 660 km. It traveled the first part of the distance at a speed of 80 km/h for 6 hours. We need to find the time it took for the train to cover the remaining distance at a speed of 90 km/h.

Calculation

To find the time it took for the train to cover the remaining distance, we can use the formula:

Time = Distance / Speed

Let's calculate the time it took for the train to cover the remaining distance.

The distance covered in the first part of the journey is 6 hours * 80 km/h = 480 km.

Therefore, the remaining distance is 660 km - 480 km = 180 km.

Using the formula, the time it took for the train to cover the remaining distance at a speed of 90 km/h is:

Time = 180 km / 90 km/h = 2 hours

Answer

The train took 2 hours to cover the remaining distance at a speed of 90 km/h.