[填空题]
A square uniform raftc h 4ff7.oyer4, 18 m btxx+r,hbye4 0y 18 m, of mass 6800 kg, is used as a ferryboat. If three cars, each of mass 1200 kg, occupy4xyrbx e 0t,h+ its NE, SE, and SW corners, determine the CM of the loaded ferryboat.$X_{CM}$ = m $Y_{CM}$ = m