Solve the applied problem.A rope is to be stretched at uniform height from a tree to a 35-...

Solve the applied problem.

A rope is to be stretched at uniform height from a tree to a 35-foot-long fence, which is 20 feet from the tree, and then to the side of a building at a point 30 feet from the fence, as shown in the figure. If 63 feet of rope is to be used, how far from the building wall should the rope meet the fence?