Question

Велосипед ехал 30 минут со скоростью 30 км/ч, оставшиеся 39 км по шоссе он проехал за 78 мин. Чему равна средняя скорость на всем пути?

Answer 1

Ответ:

50 м/мин 3 км/ч

Пошаговое объяснение:

30:2=15км

39+15=54км

30+78=108мин

54:108=0.5=50 м/мин

50*60:3000=3 км/ч

Answer 2

Ответ:

30 км/ч

Пошаговое объяснение:

1 час = 60 минут

30 минут = 30 : 60 = 0,5 часа

78 минут = 78 : 60 = 1,3 часа

1) 0,5 * 30 = 15 (км) - проехал за 0,5 часа

2) 0,5 + 1,3 = 1,8 (часа) - был всего в пути

3) 15 + 39 = 54 (км) - проехал всего

4) 54 : 1,8 = 30 (км/ч) - средняя скорость на всём пути

Answer 3

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 distance and total time for the entire journey.

1. Calculating Total Distance: - Distance covered at 30 km/h for 30 minutes = 30 km/h * (30 min / 60 min) = 15 km - Remaining distance covered in 78 minutes = 39 km - Total distance = 15 km + 39 km = 54 km

2. Calculating Total Time: - Time taken at 30 km/h for 30 minutes = 30 minutes - Time taken to cover the remaining 39 km in 78 minutes

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

3. Calculating Total Time Taken for the Entire Journey: - Total time = 30 minutes + 78 minutes = 108 minutes

Now that we have the total distance and total time, we can calculate the average speed for the entire journey.

4. Calculating Average Speed: - Average Speed = Total Distance / Total Time - Average Speed = 54 km / (108 min / 60 min/h) = 30 km/h

The average speed for the entire journey is 30 km/h.