Question

Из одного пункта в другой велосипедист двигался со скоростью 30 км в час, обратный путь был им пройден со скоростью 5 км в час.Определите среднюю скорость велосипедиста за всё время движения?

Answer 1

Нашла вот это: 
Скорость вперед составляла 30км/ч, скорость назад 5м/с или (5*3600/1000=18км/ч). Т.е. м/с перевели в км/ч, теперь плюсуем (30+18)/2=24км/ч. Ну, как-то так.

Answer 2

Calculation of Average Speed

To calculate the average speed of the cyclist, we can use the formula:

Average Speed = Total Distance / Total Time

In this case, the cyclist traveled from one point to another with a speed of 30 km/h and returned with a speed of 5 km/h. Let's assume the distance between the two points is 'd'.

The time taken to travel from one point to another at a speed of 30 km/h can be calculated using the formula:

Time = Distance / Speed

Therefore, the time taken to travel from one point to another is 'd / 30'.

The time taken to return from the second point to the first point at a speed of 5 km/h can be calculated using the same formula:

Time = Distance / Speed

Therefore, the time taken to return from the second point to the first point is 'd / 5'.

The total time taken for the entire journey is the sum of the time taken to travel from one point to another and the time taken to return from the second point to the first point:

Total Time = (d / 30) + (d / 5)

The total distance covered during the entire journey is the sum of the distance traveled from one point to another and the distance traveled from the second point to the first point:

Total Distance = 2d

Now, we can substitute the values of 'Total Distance' and 'Total Time' into the formula for average speed:

Average Speed = Total Distance / Total Time = (2d) / [(d / 30) + (d / 5)]

Simplifying the equation:

Average Speed = (2d) / [(d / 30) + (d / 5)]

Let's calculate the average speed using this formula.