Calculate the angular velocity and linear velocity of both wheels assuming the larger wheel rotates at 120 revolutions per min (20RPM)

120 revolutions per min is (20RPM)

120revolutions is 240 Pi radians (because 1 revolution is 2Pi rad)

angular velocity

w = 240Pixf, f is the frequency and f = 1/T, T = 1mn=60s=period, so f=1/60=0.01Hz

so w = 240*Pi*0.01=12.56 rad / s

linear velocity can be found with

V = Rx w,

V=12.56 R the value depends on what value is the radius of both wheels