Question

У кружковца Кирилла сегодня 3 урока по 45 минут, между ними есть перемены: одна большая — 30 минут, а все остальные одинаковые. Кирилл приходит в школу за 10 минут до первого урока — в 8:50, а уходит, еще даже не начав делать уроки на завтра, через 4 часа 10 минут после конца последнего — в 16:00. Сколько длится каждая короткая перемена?

Answer 1

Ответ:

15 минут

Пошаговое объяснение:

потому что как правило большая перемена в 2 раза больше чем обычная

Answer 2

Calculation of Break Times

To calculate the duration of each short break, we need to determine the total duration of the school day and subtract the duration of the long break and the time spent in school before and after the lessons.

According to the information provided, Kirill has 3 lessons, each lasting 45 minutes. There is one long break of 30 minutes and all other breaks are the same duration. Kirill arrives at school 10 minutes before the first lesson at 8:50 and leaves 4 hours and 10 minutes after the end of the last lesson at 16:00.

Let's calculate the total duration of the school day:

- 3 lessons * 45 minutes per lesson = 135 minutes for lessons - 2 short breaks * x minutes per break (to be determined) - 1 long break * 30 minutes per break = 30 minutes for the long break

The total duration of the school day can be calculated as follows:

Total duration = 135 minutes + 2x minutes + 30 minutes

We also know that Kirill spends 10 minutes at school before the first lesson and 4 hours and 10 minutes after the last lesson. This means that the total duration of the school day is equal to the time Kirill spends at school:

Total duration = 10 minutes + 135 minutes + 2x minutes + 30 minutes + 4 hours and 10 minutes

To simplify the calculation, let's convert 4 hours and 10 minutes to minutes:

4 hours = 4 * 60 minutes = 240 minutes 10 minutes = 10 minutes

Total duration = 10 minutes + 135 minutes + 2x minutes + 30 minutes + 240 minutes + 10 minutes

Now we can solve for x:

Total duration = 425 minutes + 2x minutes

Since the total duration of the school day is equal to the time Kirill spends at school, we can equate the two expressions:

425 minutes + 2x minutes = 10 minutes + 135 minutes + 2x minutes + 30 minutes + 240 minutes + 10 minutes

Simplifying the equation:

425 minutes + 2x minutes = 425 minutes + 2x minutes

This means that the duration of each short break is not determined by the information provided.