Question

1-ую половину пути мотоциклист проехал со скоростью 30км/ч, а вторую-со скоростью 60км/ч. какова средняя скорость мотоциклиста?

Answer 1

60 км/ч+30 км/ч=90 км/ч
90 км/ч:2=45 км/ч

Answer 2

Calculating Average Speed of a Motorcyclist

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

Average Speed = Total Distance / Total Time

First, let's calculate the total distance traveled by the motorcyclist.

The motorcyclist traveled the first half of the distance at a speed of 30 km/h and the second half at a speed of 60 km/h.

The time taken for each half can be calculated using the formula time = distance / speed.

For the first half: - Speed = 30 km/h - Time = Distance / Speed

For the second half: - Speed = 60 km/h - Time = Distance / Speed

Let's denote the total distance as D and the time taken for each half as t1 and t2.

Calculating Time for Each Half

Using the given information, we can calculate the time taken for each half of the journey.

For the first half: - Time taken, t1 = D / 30

For the second half: - Time taken, t2 = D / 60

Calculating Total Time

The total time taken for the journey is the sum of the times taken for each half.

Total Time = t1 + t2

Calculating Average Speed

Now, we can calculate the average speed using the formula:

Average Speed = Total Distance / Total Time

Let's proceed with the calculations.

Calculation

- Time taken for the first half, t1 = D / 30 - Time taken for the second half, t2 = D / 60 - Total Time = t1 + t2 - Average Speed = Total Distance / Total Time

Result

The average speed of the motorcyclist can be calculated using the above approach.