Which pair of transformations moves quadrilateral 1 to quadrilateral 2

If the students are in school for 7 hours and are able to switch classes every 20 minutes, you can calculate how many classrooms in all can the students visit.

7 hours = 7 * 60 minutes = 420 minutes

420 minutes / 20 minutes = 21 classrooms

Result: The students can visit 21 classrooms.