Question

3. [4] Турист, путешествуя по реке, прошел 20 минут со скоростью (6 км/ч на байдарке, затем на теплоходе 3 часа со скоростью 32 км/ч, оставшийся 12 км прошел на катере со скоростью 18 км/ч. Чему равна средняя скорость на всем пути?​

Answer 1

Ответ:

Ответ: 16 км/ч средняя скорость

Пошаговое объяснение:

1) 20*6=120 км

2) 32*3=96 км

3) 12*18=216 км

4) (120+216+96):(18+3+6)=432:27=16 км/ч средняя ск

лучший ответ

Answer 2

Calculating Average Speed for the Entire Journey

To calculate the average speed for the entire journey, we can use the formula:

Average Speed = Total Distance / Total Time

First, let's calculate the total time taken for the entire journey.

The traveler spent 20 minutes at a speed of 6 km/h on a kayak, 3 hours at a speed of 32 km/h on a steamboat, and the remaining 12 km at a speed of 18 km/h on a motorboat.

The total time taken for the journey can be calculated as: 20 minutes + 3 hours + (12 km / 18 km/h)

Let's convert all units to a common unit, hours, for consistency.

20 minutes = 20/60 hours = 1/3 hours 3 hours = 3 hours 12 km / 18 km/h = 2/3 hours

So, the total time taken for the journey is: 1/3 hours + 3 hours + 2/3 hours = 4 hours

Now, let's calculate the total distance covered during the journey.

The traveler covered 12 km on the motorboat, and the distances covered on the kayak and steamboat are not provided. We'll need to calculate these distances first.

Let's denote the distance covered on the kayak as D1 and the distance covered on the steamboat as D2.

The total distance covered during the journey can be calculated as: D1 + D2 + 12 km

We can use the formula: Distance = Speed × Time

We'll calculate the distances covered on the kayak and steamboat using the given speeds and times.

The distance covered on the kayak (D1) can be calculated as: D1 = Speed × Time D1 = 6 km/h × (1/3 hours) D1 = 2 km

The distance covered on the steamboat (D2) can be calculated as: D2 = Speed × Time D2 = 32 km/h × 3 hours D2 = 96 km

Now, we can calculate the total distance covered during the journey: Total Distance = 2 km + 96 km + 12 km Total Distance = 110 km

Finally, we can calculate the average speed for the entire journey using the formula: Average Speed = Total Distance / Total Time Average Speed = 110 km / 4 hours Average Speed = 27.5 km/h

So, the average speed for the entire journey is 27.5 km/h.