At a particular time of a day a 7 m high flag staff casts a shadow which is 8.2 m long what is the building which casts a shadow 20.5 m in length at the same moment

An observer(o) spots a plane(p) taking off from a local airport and flying at a 29 degree angle horizontal to her line of sight and located directly above a tower(t). the observer also notices a bird circling directly above her. if the distance from the plane(p) to the tower(t) is 6,000ft., how far is the bird(b) from the plane(p).