Question

Когда Петя учился во 2 классе, скорость его чтения была 45сл/мин. В 4 классе скорость чтения Пети - 135сл/мин. За сколько часов смог бы 4класник Петя прочитать книгу, которую во 2 классе он читал в течение 4ч? Помогите!!!!Пожалуйста!!!

Answer 1

1)45*240=10800(с) - в книге
2)10800:135=80 минут или 1 час и 20 минут

Answer 2

1) 135:45=180 слов
2)180:135=1 мин 45 секунд

Answer 3

Calculation of Reading Time

To calculate the time it would take 4th-grade Petia to read a book he read in 2nd grade, we can use the following formula:

Time = Number of pages / (Reading speed in pages per minute)

First, let's calculate the number of pages in the book.

Number of Pages in the Book

To estimate the number of pages in a typical book for a 2nd grader, we can use an average of 200 pages.

Calculation

Using the given reading speeds: - 2nd grade reading speed: 45 words per minute - 4th grade reading speed: 135 words per minute

We can calculate the time it would take 4th-grade Petia to read the book he read in 2nd grade.

Time = Number of pages / (Reading speed in pages per minute)

Time = 200 pages / (45 words per minute) Time = 200 / 45 Time ≈ 4.44 hours

So, it would take approximately 4.44 hours for 4th-grade Petia to read the book he read in 2nd grade, assuming the book has an average of 200 pages.