Bonus A chord of the circle whose equation is x² + y² = 57 is tangent to the circle whose equation is x² + y² = 32 at the point (4,-4). Find the length of the chord. (EXPLAIN PLEASE!)

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?