Norman Vanua and all-rounder Charles Amini were instrumental taking four wickets a piece in the ninth place playoff.
Knocks from Tony Ura (49), Chad Soper (39) and Mahuru Dai (35) helped the Barras reach 200.
Vanua (4/24) and Amini (4/27) tore through the Hong Kong batting order to have them all bowled out for 142 inside 35 overs.
For the Barras, the win salvaged some pride after losing their One Day International status.
Yesterday’s fixture was the 4000th ODI to be played.
Papua New Guinea 200 (Ura 49, Shah 4-11) beat Hong Kong 142 (Hayat 37, Vanua 4-24, Amini 4-27) by 58 runs