Answer:
Option C. 
Step-by-step explanation:
we know that
In the rectangle of the figure

so

The constant is equal to 
The answer is D
Because there are two x’s
And 5 number 1’s
So 2x=5
18+8/4x2
18+8/8
18+1
PEMAS
parentheses,
11km = 5h
1km = 5h divide by 11km = 0.45h
16.5km = 0.45 x 16.5 = 7.42 h