Only part B pls

If gear A rotates with a constant angular acceleration of A=90rad/s2, starting from rest, determine the time required for gear D to attain an angular velocity of 600rpm. Gears A,B,C, and D have radii of 15mm,50 mm,25mm, and 75mm, respectively. Express your answer to three significant figures and include the appropriate units. Part B Also, find the number of revolutions of gear D to attain this angular velocity. Express your answer to three significant figures and include the appropriate units