2/6 in its simplest form

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Witch represents the inverse of the function f(x)=1/4x-12

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?