Posted: March 13th, 2017
A compound gear train comprises four gears A, B, C and D having 15, 20, 30 and 40 teeth respectively. While gear A is fitted to the drive shaft, gear D is fixed to the driven shaft. Compound gear B meshes with A while gear C meshes with D. If the speed of rotation of gear A is 200 rpm, determine the speed of gear D.
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