Center Of Mass

In a system two particles of masses \(m_1=3 \mathrm{~kg}\) and \(m_2=2 \mathrm{~kg}\) are placed at certain distance from each other. The particle of mass \(m_1\) is moved towards the center of mass of the system through a distance \(2 \mathrm{~cm}\). In order to keep the center of mass of the system at the original position, the particle of mass \(m_2\) should move towards the center of mass by the distance _________ \(\mathrm{cm}\).