A two-cylinder locomotive running at 200 rpm has a slider of mass of 10 kg. The two third of the piston mass is used at a radius equal to the crank radius for balancing the forces. Find the magnitude of the swaying couple (N.m) when the crank is at an angle of 60° to the line of stroke. Distance between cylinders of the locomotive is 0.6 m & stroke length is 20 cm [upto nearest integer]