Physics Help!!!?

The page feed roller of a computer printer grips each 11-inchlong sheet of paper and feeds it through the print mechanism. If the roller has a radius of 6.8 mm and the drive motor has a maximum angular speed of 490 rpm, what is the maximum number of pages that the printer can print each minute? I have absolutely no idea how to do this, if anyone can explain it it would be great help

Boris 24

Roller circumference L = 2πr = 6.28 x 6.8 = 42.7mm When spinning roller makes 490 x 42.7 = 20923 mm Papear sheet has length 11.2 x 25 = 280 mm In one minute number of pages printer prints = 20923 / 280 = 74