a painter can paint a fence around a house in 6hours. Working alone, the painter's apprentice can paint the same fence in 10 hours. how many hours would it take them to do the job if they worked together

An airplane is flying at an elevation of 5150 ft, directly above a straight highway. two motorists are driving cars on the highway on opposite sides of the plane, and the angle of depression to one car is 35 ̊ and to the other is 52 ̊. how far apart are the cars?