BC = EF
the side has to lie between the two angles
We can't see the questions from this picture of you show a picture that we can see or type the answers we can answer
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
The mass of an object will never change no matter what, however, the weight relies on gravity. So therefore, the answer would be D.