Three masses 700 g , 500 g , and 400 g are suspended at the end of as spring as shown and…

Three masses 700 g, 500 g, and 400 g are suspended at the end of as spring as shown and are in equilibrium. When the 700g mass is removed, the system oscillates with a period of 3 seconds, when the 500 gm mass is also removed, it will oscillate with a period of  
  \[\begin{array}{c} \text { mymm } \\ 8 \\ 8 \\ 8 \\ 700 \mathrm{gm} \\ \hline 500 \mathrm{gm} \\ \hline 400 \mathrm{gm} \\ \hline \end{array}\]