Fifteen sprinters ran the 50-yard dash in an average of 9.5 seconds. of those runners,3 ran the dash in 11.5 seconds. find the average time of the other 12 boys

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?