Athree cylinder engine has its cranks spaced 120 apart. the distance between che planes of adjacent cranks is 0.9 m. the revolving masses attached to each crank are equivalent to 200 kg at 200 mm radius. find the magnitude and angular position of the balancing masses required at 500 : nm radius in planes 1.2 m and 0.6 m on opposite sides of the centre crank.