Answer:
millimeter per second
Step-by-step explanation:
You simply need to divide
. This is a fraction, so you can just simplify it.
Divide the numerator and the denominator each by 6, which is the greatest common factor.
![((18)/(6))/((24)/(6)) = (3)/(4)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/k8hizcbrhz4kc6hmgxq24jfsrgencakfqo.png)
This is as simple as the result can get, so
millimeter per second is the final answer.