A1200 kg aircraft going40 m/s collides with a2500 kg aircraft that is parked and they stick together after the collision and are going13 m/s after the collision. If they skid for 130.5 m before stopping, how long (in seconds) did they skid? Hint: Are the aircraft moving at a constant velocity after the collision or do they experience an acceleration? Enter only your numerical answer to one decimal place.