Question

автомобиль проехал 15 км за 20 мин, а потом ещё 50 км за 40 мин. Какова его средняя скорость за всё время движения? ______________ помоги срочно!!!!

Answer 1

средняя скорость=все расстояние/все время в пути.

1)15+50=65км-всего проехал.

2)20+40=60мин=1ч

3)65:1=65км/ч-средняя скорость за всё время движения

Answer 2

Calculation of Average Speed

To calculate the average speed of the car, we need to determine the total distance traveled and the total time taken.

The car traveled 15 km in 20 minutes and then an additional 50 km in 40 minutes.

Let's calculate the total distance traveled and the total time taken:

- Distance traveled: 15 km + 50 km = 65 km - Time taken: 20 minutes + 40 minutes = 60 minutes

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

Average Speed = Total Distance / Total Time

Substituting the values:

Average Speed = 65 km / 60 minutes

To convert the average speed to a more common unit, we can convert minutes to hours:

Average Speed = 65 km / (60 minutes / 60 minutes per hour)

Simplifying the expression:

Average Speed = 65 km / 1 hour

Therefore, the average speed of the car for the entire duration of the journey is 65 km/h.