90 miles = 1 3/4 hours
360=90*4 so
1 3/4 * 4 = 7 hours
If you’re asking how much she earned last week, she would have earned $339.30 which is just $8.70 times 39
306 is the answer for the last
There are 3 ways of solving a simultaneous problem, substitution method, elimination method and Gauss-Jordan method. I'm gonna use the substitution method since it's easier and i think it would suit your level more.
First let's try solving for y since it's easier to start with.
Firstly we have to find an equation for x:

Great, now we can use the substitution method to find the value of y using the first equation:

Now we know that y=1 we can solve the first equation we made:

And the answer is 
Double check:

And that's our final answer! (4,1)
4/3 = AD/EH (similarity)
hence, AD= EH*4/3=60*4/3=80
so, 80