Question

Автомобиль первую часть пути прошёл за 2,8 ч, а вторую- за 1,2 ч. Во сколько раз меньше времени израсходовано на вторую часть пути, чем на первую? Сколько процентов всего времени движения затрачено на первую часть пути?

Answer 1

(1) 2,8/1,2 = 28/12 = 7/3 = 2 целые 1/3 (раза) - во столько раз меньше времени израсходовано на вторую часть пути, чем на первую.
(2) ★ 2,8 + 1,2 = 4 (ч) - всё время движения.
★ 4 ч → 100%
2,8 ч → х%
4/2,8 = 100/х
х = (2,8 × 100)/4
х = 0,7 × 100
х = 70 (%) - столько процентов всего времени движения затрачено на первую часть пути.
Ответ: 2 целые 1/3 раза; 70%

Answer 2

Calculation of Time Difference and Percentage

To find out how much less time was spent on the second part of the journey compared to the first part, we need to calculate the time difference between the two parts.

Let's assume that the total distance traveled is the same for both parts of the journey.

The first part of the journey took 2.8 hours, and the second part took 1.2 hours.

To find the time difference, we subtract the time taken for the second part from the time taken for the first part:

Time difference = Time taken for the first part - Time taken for the second part

Time difference = 2.8 hours - 1.2 hours = 1.6 hours

Therefore, the second part of the journey took 1.6 hours less than the first part.

To calculate the percentage of the total travel time spent on the first part of the journey, we need to divide the time taken for the first part by the total travel time and multiply by 100.

Let's assume the total travel time is the sum of the time taken for the first and second parts of the journey.

Total travel time = Time taken for the first part + Time taken for the second part

Total travel time = 2.8 hours + 1.2 hours = 4 hours

To calculate the percentage, we use the following formula:

Percentage = (Time taken for the first part / Total travel time) * 100

Percentage = (2.8 hours / 4 hours) * 100 = 70%

Therefore, 70% of the total travel time was spent on the first part of the journey.

Please note that these calculations assume that the total distance traveled is the same for both parts of the journey.