In the gear train shown gear 3 is carried on arm 5, Gear

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

1. 166.7 counterclockwise
2. 166.7 clockwise
3. 62.5 counterclockwise
4. 62.5 clockwise

Given T₂ = 60
N₂ = 0
T₃ = 20
T₄ = 100
N₂ = 100 rpm (ccw)
Relative velocity equation

1.6N_a = 100
N_a =62.5 rpm (ccw)