8 - m/n + p^2
8 - 8/2 + 2^2
8 - 4 + 4
4 + 4
8
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Obtuse because it only takes one obtuse angle to make an obtuse triangle
So that is equal to 180 miles per 2 hours which is 90 miles per hour if each hour has the same m/hr rate.
You can set up a proportion:
let x = number of miles per hour

cross multiply and you get
2x=180
divide both sides by 2 and you get
x=90
so you get the same answer both ways,
90 miles per hour