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To find the constant of proportionality, we divide the number of pages read by the amount of time it takes.
For Jimmy, the constant of proportionality is 15 pages / 5 minutes = <<15/5=3>>3 pages per minute.
For Carlo, the constant of proportionality is 12 pages / 6 minutes = <<12/6=2>>2 pages per minute.
To compare the proportional relationships, we can say that for every minute Jimmy reads 3 pages, while Carlo reads 2 pages.