It takes John 45 minutes to read 9 pages of a book at this same rate, how long will it take him to read 12 pgs?

45/9 = x/12

x = 60

To calculate the time it will take John to read 12 pages, we need to determine how long it takes him to read one page and then multiply that time by 12.

First, let's find out how long it takes John to read one page. We'll set up a ratio with his reading time and the number of pages read:

45 minutes to read 9 pages = x minutes to read 1 page

To find the value of x, we can use proportions:

(45 minutes / 9 pages) = (x minutes / 1 page)

We can simplify the equation by cross-multiplying:

45 minutes * 1 page = 9 pages * x minutes

45 = 9x

Now, isolate x by dividing both sides by 9:

45 / 9 = x

5 = x

So, it takes John 5 minutes to read one page.

Now, we can calculate the time it will take him to read 12 pages by multiplying the time to read one page by 12:

5 minutes per page * 12 pages = 60 minutes.

Therefore, it will take John 60 minutes, or one hour, to read 12 pages.