Question

Двигаясь по шоссе, велосипедист ехал 30 мин со скоростью 20 км/ч, затемпроселочную дорогу он преодолел за 10 мин со скоростью 12 км/ч, а оставшиеся36 км по шоссе он проехал за 1 ч 20 мин. Чему равна средняя скорость на всемпути?​

Answer 1

Ответ:

24 км/ч

Пошаговое объяснение:

1) 20 * 0,5 = 10 (км) - первая часть пути

2) 12 * 1/6 = 2 (км) - вторая часть пути

3) 10 + 2 + 36 = 48 (км) - весь путь

4) 0,5 + 1/6 + 1 1/3 = 2 (ч) - все время

5) 48 : 2 = 24 (км/ч) - средняя скорость

Answer 2

30 мин= 1/2 часа

10мин. =1/6  часа

1час 20 мин. = 1 1/3 часа

20 * (1/2) = 10 (км) - первая часть пути

12 * 1/6 = 2 (км) - вторая часть пути

10 + 2 + 36 = 48 (км) - общий  путь

1/2 + 1/6 + 1 1/3 = 2 (ч) - общее время

48 : 2 = 24 /км/ч/- средняя скорость

Answer 3

To find the average speed for the entire journey, we need to calculate the total distance traveled and the total time taken. Let's break down the information given:

- The cyclist traveled on the highway for 30 minutes at a speed of 20 km/h. - Then, the cyclist traveled on a country road for 10 minutes at a speed of 12 km/h. - Finally, the cyclist traveled the remaining 36 km on the highway in 1 hour and 20 minutes.

Calculating the Total Distance Traveled:

The total distance traveled can be calculated by adding the distances covered on the highway and the country road.

- Distance on the highway: 20 km/h * (30 minutes / 60 minutes) = 10 km - Distance on the country road: 12 km/h * (10 minutes / 60 minutes) = 2 km

Total distance traveled = 10 km + 2 km = 12 km

Calculating the Total Time Taken:

The total time taken can be calculated by adding the time spent on the highway and the country road.

- Time spent on the highway: 30 minutes + 1 hour and 20 minutes = 1 hour and 50 minutes - Time spent on the country road: 10 minutes

Total time taken = 1 hour and 50 minutes + 10 minutes = 2 hours

Calculating the Average Speed:

The average speed can be calculated by dividing the total distance traveled by the total time taken.

Average speed = Total distance traveled / Total time taken = 12 km / 2 hours

To convert the average speed to km/h, we divide by the number of minutes in an hour (60 minutes).

Average speed = (12 km / 2 hours) * (60 minutes / 1 hour) = 6 km/h

Therefore, the average speed for the entire journey is 6 km/h.

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