Answer:because in division you should be going down, the complete opposite of multiplying,if your answer is above yuo are incorrect
The answer should be D since after 5 am to 7 am only two hours have passed so x=2, and then you plug in the x as 2 and solve it. You might get not around answer like 39.785 but when you round it, it would be 40.
To solve this you can make a proportion where the matching sides will correspond to each other. It should look something like this:


Now you must cross multiply
10*42 = 15*x
420= 15x
To isolate x divide 15 to both sides
420/15 = 15x/15
28 = x
Hope this helped!
~Just a girl in love with Shawn Mendes
X=2/3
This is the answer
In other way is
X=0.6