Do what is in the parentheses then add
I would think it would be 200km before rob caught up with him?
These are all negative SO the number that is the greatest would be -.480.
Simple....
you have:

to convert them into
improper fractions:
1.) Take whole number*denominator
(5*5=25)
2.) Take what you got...and
add the numerator
(25+2=27)
3.) Use the original denominator

Do the same to the other one...
2*13=26
26+10=36

Now..add...

But..you need a common denominator!


Now you can add!

When simplified....

Thus, your answer.
Since the triangles are similar, they will have proportional sides. With this knowledge, we can make the proportion
to solve for x.
Firstly, cross multiply: 
Next, divide by 10 on both sides, and your answer will be 4 = x, or the first option.