GATE Mechanical Engineering (ME) 2016 Shift 1 Solved Paper

In the gear 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 counter-clockwise direction, the angular speed of arm 5 (in rpm) is