Question

Мотоциклист полпути ехал со скоростью 80 км/ч, а остаток пути — со скоростью 60 км/ч. Какой была средняя скорость мотоциклиста на всем пути?Ответ НЕ 70 . Он долже быть 68.6 км в час. Люди помогите пожалуйста. УМОЛЯЮЮЮ.

Answer 1

Vcр=Sвесь/tвсе
Vср=(S1+S2)/(t1+t2)
V1=S1/t1
t1=S1/V1
Vср=(S1+S2)/((S1/V1)+(S2/V2)=S/(S((1/(2V1))+(1/(2V2)))+(S*2V2V1)/(S(V2+V1) =(2V1V2)/(V1+V2)
Знаю, что скобочек очень много и выглядит сложно, но это правильное решение. Нам на курсах разбирали и выводили это решение)

Answer 2

Calculating the average speed of the motorcyclist

To calculate the average speed of the motorcyclist, we need to consider the distances traveled at each speed and the time taken for each segment.

Let's assume that the motorcyclist traveled a total distance of 100 kilometers. The first segment was covered at a speed of 80 km/h, and the remaining distance was covered at a speed of 60 km/h.

To find the time taken for each segment, we can use the formula: time = distance / speed.

For the first segment: - Distance = 50 kilometers (half of the total distance) - Speed = 80 km/h - Time = 50 km / 80 km/h = 0.625 hours

For the second segment: - Distance = 50 kilometers (remaining half of the total distance) - Speed = 60 km/h - Time = 50 km / 60 km/h = 0.833 hours

Now, we can calculate the total time taken for the entire journey by summing the times for each segment: - Total time = 0.625 hours + 0.833 hours = 1.458 hours

Finally, we can calculate the average speed by dividing the total distance by the total time: - Average speed = 100 km / 1.458 hours ≈ 68.6 km/h

Therefore, the average speed of the motorcyclist for the entire journey is approximately 68.6 km/h.

Please note that the above calculation assumes a total distance of 100 kilometers and specific speeds for each segment. If the actual values differ, the average speed will also differ.

I hope this helps! Let me know if you have any further questions.