Mark can clean a house in 7 hours. When he cleans the same house with Wendy, it takes them 3 hours to clean the house. How long would it take Wendy to clean the house by herself? Write your answer as a decimal.

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .