Calc 1 homework

please write neatly (do not type)

please show work

12.}Two commercial airplanes are flying at an altitude of 4U,Utt along straightline course that intersect at right angles. Plane A is approaching the intersection point at a speed of 422 knots [nautical miles per hour; a nautical mile is 2000 15rd}. Plane Bis approaching the intersection at 481 knots. At what rate is the distance between the planes changing when A is 5 nautical miles from the intersection point and Bis 12 nautical miles from the intersection point