Consider a 2-cylinder locomotive engine having cranks perpendicular to each other. The plane gap between the cylinders is 0.7 m and radius of the crank is 0.3 m. The total mass of reciprocating part is 80 kg. If (2/3) of the reciprocating mass is to be balanced, then what is value of the swaying couple (in kN.m) if the crank angle is 60°. The engine speed is 300 rpm.