As we can see the given diagram represents an isosceles trapezoid.
So we can say from the properties of isosceles trapezoid.


As the required side XY has a length y+1, So we can write

Answer:
230.55/8.70 = 26.5 hours (round as appropriate)
Bill's original ratio is like this...
6 to 10
You need to solve for this...
x to 15
You have to multiply both sides of the original ratio by 15...
6 times 15 = 90
10 times 15 = 150
Your new ratio is 90 to 150
Which reduces to 3 to 5
Yout new ratio is 3 to 5