so if 5.5 is in meter let change it to cm because the question want us to give the answer in cm.
![1cm = 0.01meter](https://img.qammunity.org/2020/formulas/mathematics/middle-school/d94j7spyz7aqbhwg5v2mwjvs5l5cpsq7um.png)
![to \: turn \: meters \: into \: \\ cm \: we \: have \: to \: multiply \: by \: 100](https://img.qammunity.org/2020/formulas/mathematics/middle-school/u472nqr8iw79ws4giuvxgv1730pcals2aw.png)
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.