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A single epicyclic gear train is shown in the given figure. Wheel A is stationary. If the number of teeth on A and B are 120 and 45 respectively, then when B rotates about its own axis at 100 rpm, the speed of C would be 

                         

        (a) 20 rpm                                      (b) $27\frac{13}{11}$ rpm

         (c)19$\frac{7}{11}$ rpm                                (d) 100 rpm

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