Question

Папа проедет расстояние от квартиры до дачи за 15 минут, если будет ехать со средней скоростью 80 км/час, а Даня, то же расстояние проедет за 1 час.Сколько времени Даня проведет за рулем автомобиля,если3/4путиот квартиры до дачи за рулем сидел папа?

Answer 1

1) 80 км ·(15/60)=20 км путь от квартиры до дачи;
2)20 км : 1 час = 20 км в час скорость Дани
3)(3/4)·20 км= 15 км за рулем будет находиться папа
4)20-15=5 км за рулем будет находиться Даня
5)5:20=1/4 часа=15 минут  за рулем будет находиться Даня.
 О т в е т. 15 минут

Answer 2

Calculation of Time Spent by Danya Driving

To calculate the time spent by Danya driving, we need to determine the distance between the apartment and the dacha and the speed at which Danya is driving.

Given the information provided, we know that Danya will cover the same distance as his father, but at a different speed. Danya will take 1 hour to cover the distance, while his father will take 15 minutes (0.25 hours) at an average speed of 80 km/h.

Let's calculate the distance between the apartment and the dacha using the formula:

Distance = Speed × Time

For Danya, the distance is the same as his father's, and the time is 1 hour. Therefore, we can write:

Distance = Speed × Time

Distance = 80 km/h × 1 hour

Distance = 80 km

Now, we need to determine how much of the distance Danya has covered while his father was driving. According to the information provided, Danya has covered 3/4 of the distance.

Let's calculate the distance covered by Danya:

Distance Covered by Danya = (3/4) × Distance

Distance Covered by Danya = (3/4) × 80 km

Distance Covered by Danya = 60 km

Since we know the distance covered by Danya and the speed at which he is driving, we can calculate the time spent by Danya driving using the formula:

Time = Distance / Speed

Time = 60 km / 80 km/h

Time = 0.75 hours

Therefore, Danya will spend 0.75 hours (or 45 minutes) behind the wheel of the car.

Please note that the calculations provided are based on the information given in the question.