Well I’m not completely sure on this one, though I’m fairly sure it’s right.
If you make 22 ‘L’ per minute, to find out how much you would make in an hour all you would have to do is multiply how much ‘L’ you make a minute (22) * 60 (for 60 minutes, or an hour.)
22 * 60 = 1320, so you would make 1320 ‘L’ an hour.
Hope this helps :)