Can you guys help me out?

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

A)a square brown tarp has a square green patch green in the corner the side length of the tarp is (x + 8) and the side length of the patch is x what is the area of the brown part of the tarpb)a square red placemat has a gold square in the corner the side length of the gold square is (x - 2) inches with the width of the red region is 4 in what is the area of the red part of the placemat

What is the value of x in the equation 3x4y65, when y=4?