Three masses 200 kg, 300 kg and 400 kg are placed at the vertices of an equilateral triangle with sides 20 m. They are rearranged on the vertices of…

Three masses $\displaystyle 200 \mathrm{~kg}, 300 \mathrm{~kg}$ and $\displaystyle 400$ kg are placed at the vertices of an equilateral triangle with sides $\displaystyle 20$ m . They are rearranged on the vertices of a bigger triangle of side $\displaystyle 25$ m and with the same centre. The work done in this process $\displaystyle \_\_\_\_$J. (Gravitational constant $\displaystyle \mathrm{G}=6.7 \times 10^{-11} \mathrm{~N} \mathrm{~m}^2 / \mathrm{kg}^2$ )