Question

1. In the gear train shown, gear 3 is carried on arm 5. Gear 3 meshes with gear 2 and gear 4. The number of teeth on gear 2, 3, and 4 are 60, 20, and 100, respectively. If gear 2 is fixed and gear 4 rotates with an angular velocity of 100 rpm in the counterclockwise direction, the angular speed of arm 5 (in rpm) is                  

   

           (A) 166.7 counterclockwise                            (B) 166.7 clockwise                                               (C) 62.5 counterclockwise                              (D) 62.5 clockwise