Two piece model rocket

A model rocket is made up of two pieces: Piece A has a mass of 1.5 kg and piece B has a mass of .5 kg. The rocket is fired from ground level with a launch speed of 60 m/s at an angle of 37 degrees above the horizontal. When the rocket is at its highest point, piece B is propelled straight backward with a speed of 20 m/s relative to the ground. How far from its initial launch point does piece A land?