While making a non-stop trip, a bus averaged $m$ mph for the first $5$ hours and $n$ mph, for the remaining $4$

While making a non-stop trip, a bus averaged $m$ mph for the first $5$ hours and $n$ mph, for the remaining $4$ hours. What was the average speed of the bus, in mph, for the whole trip?

1) $7.5m + 6n = 465$
2) $2m + 3n = 180$

The OA is A

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