Answer:
B
Step-by-step explanation:
Bill paints 1/2 per hour. Bob paints 1/3 per hour. 1/2x+1/3x=1
It is given that the triangle is isosceles right triangle . And in an isosceles right triangle the legs are equal . Let each leg be of x units. Now we use pythagorean identity, which is





So the length of each leg is 
8000 is 80*100. Use a calculator if you can't solve this in your head. c: