The input shaft of the gear box shown has a gear A with 40 teeth, which meshes with gear B on the lay shaft having 60 teeth. The lay shaft has an output gear C having 50 teeth,which meshes with gear D on the output shaft having 60 teeth. Compute: A. The gear ratio. B. The speed of the input shaft, if the speed of the output shaft is 1800 rpm. C. The centre distance (L). D. The module of gears A and B, if the module of gears C and D is 4 mm. E. The circular pitches of A/B and C/D. F. If the force of compression approximately equals to 1000 N, find the torque ratio and the efficiency on the input and output shafts.