Solve the Problem $y ^ { 2 } - x ^ { 2 } = 20$

Multiple Choice

Solve the problem.
-The roof of a building is in the shape of the hyperbola $y ^ { 2 } - x ^ { 2 } = 20$ , where $x$ and $y$ are in meters. Determine the distance, w, the outside walls are apart, if the height of each wall is 12 meters.

A) 11.15 meters
B) 22.3 meters
C) 124 meters
D) 12.8 meters