Question

Задача: Скорый поезд за 7 часов проехал 840 км. На сколько км /ч нужно увеличить скорость поезда, чтобы он то же расстаяние проехал за 5 часов ​

Answer 1

Ответ:

840:7=120

840:5=168

168-120=48

Answer 2

Ответ:

840/7=120км/ч

за 5 часов 840/5=168км/ч  увеличилась на 48

Пошаговое объяснение:

Answer 3

Problem Analysis

We are given that a fast train traveled 840 km in 7 hours. We need to determine how much the train's speed should be increased in order for it to cover the same distance in 5 hours.

Calculation

To find the train's current speed, we divide the distance traveled by the time taken: Current speed = Distance / Time = 840 km / 7 hours = 120 km/h

Let's denote the increased speed as x km/h. The new time taken to cover the same distance will be 5 hours. We can set up the following equation:

New speed = Distance / New time x km/h = 840 km / 5 hours

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

Solution

To find the increased speed, we divide the distance by the new time: x km/h = 840 km / 5 hours = 168 km/h

Therefore, the train needs to increase its speed by 48 km/h in order to cover the same distance in 5 hours.

Answer

The train needs to increase its speed by 48 km/h in order to cover the same distance in 5 hours.