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Eva maintained an average speed of $35\,\text{mph}$ for the first $m$ hours of her road trip. For the next $n$ hours of the trip, she drove at an average speed of $60\,\text{mph}$. Eva drove a total of $225$ miles in $4.5$ hours. Which of the following systems of equations could be used to find how many miles Eva drove in the first $m$ hours of the trip?$\newline$Choose $1$ answer:$\newline$(A) $m+n=225$$\newline$$35m+60n=4.5$$\newline$(B) $m+n=4.5$$\newline$$35 m+60 n=225$$\newline$(C) $m+n=225$$\newline$$60 m+35 n=4.5$$\newline$(D) $m+n=4.5$$\newline$$60 m+35 n=225$