Three point particles of masses $1.0 \mathrm {~kg} , 1.5 \mathrm {~kg}$ and 2.5 kg are placed at three corners of a right angle triangle of sides $4.0 \mathrm {~cm} , 3.0 \mathrm {~cm}$ and 5.0 cm as shown in the figure. The centre of mass of the system is at a point:\\
(1) 0.6 cm right and 2.0 cm above 1 kg mass.\\
(2) 1.5 cm right and 1.2 cm above 1 kg mass.\\
(3) 2.0 cm right and 0.9 cm above 1 kg mass.\\
(4) 0.9 cm right and 2.0 cm above 1 kg mass.