The linear momentum of a system of two particles is expressed as \(20\hat{i} + 30\hat{j} + 40\hat{k}\) and \(20\hat{i} + 40\hat{j} + 60\hat{k}\) Units respectively. If their center of mass has a velocity of \(4\hat{i} + 5\hat{j} + 7\hat{k}\) 4î + 5ĵ + 7k̂ unit, the mass of the system is-