An aircraft maintains a constant indicated altitude of 5 500 ft from A (1 050 ft AMSL - QNH 968 hPa) to B (650 ft AMSL - QNH 1016 hPa).Assuming that the altimeter subscale setting remains unchanged at 968 hPa, the height of the aircraft above the surface at B are: (Barometric lapse rate: 27 ft/hPa)