How long does it take for the minute hand to make one revolution? 

          60 minutes = 3600 seconds



 What is the angular speed of the tip of the minute hand? 


                      2 pi radians      
          omega  =  ------------------  =   0.001745 rad/s
                        3600 seconds



 What is the linear speed of the tip of the minute hand? 


           v     =  R * omega  =  (4.3 m) * (0.001745 rad/s)

                               =   0.0079  m/s

                               =   7.9    mm/s