Answer: The speed limit was 55 MPH.
Explanation:
We are given that a deer named Cho was crossing the highway.
Martin was driving at 60 MPH i.e. speeding 5 MPH over the speed limit.
Then, the speed limit will be :-
[tex]\text{Speed limit=}\text{60 MPH - 5 MPH}\\\Rightarrow\text{Speed limit=}(60-5)\text{ MPH}\\\Rightarrow\text{Speed limit=}55\text{ MPH}[/tex]
Therefore, the speed limit was 55 MPH.