My first problem is change 85 radians per second to revolutions per minute I know you have to use dimensional analysis.

So would It be

85 rad I am not sure how to set up the rest

-------=

1 sec

My second problem is this find the linear velocity in millimeters per second for each hand which is 30 millimeters long

I know the formula is v=r(angular velocity)

I know r= 30 but I am unsure how to find angular velocity

Can anyone help me with these two problems?