so if 5.5 is in meter let change it to cm because the question want us to give the answer in cm.
[tex]1cm = 0.01meter[/tex]
[tex]to \: turn \: meters \: into \: \\ cm \: we \: have \: to \: multiply \: by \: 100[/tex]
now we multiply 5.5 times 100 which is equal to 550.
next we subtract 550 - 220= 330.
finally, the difference between a teacher and student is 330cm .meaning the teacher's desk is 330 cm longer or taller than the student.