Gosh, this is fairly basic. I'm wondering why you're stuck because you made no statements about what you've tried or what you're thinking. (What did you do, for those 3 hours?)
Do you know what a central angle is?
Do you understand radian measure for angles?
As a wheel turns, the central angle grows.
Angular velocity is the rate at which the central angle grows. (It's usually stated as some number of radians per some unit of time.)
Each complete revolution of the wheel causes the central angle to grow by 2*Pi radians.
Therefore, if a wheel rotates once per minute, then the angular velocity is 2*Pi radians/minute.
If a wheel rotates twice per minute, then the angular velocity is 4*Pi radians/minute.
If a wheel rotates three times per minute, then the angular velocity is 6*Pi radians/minute.
If a wheel rotates four times per minute, then the angular velocity is 8*Pi radians/minute.
If a wheel rotates 10 times per minute, then the angular velocity is 20*Pi radians/minute.
In other words, if we're told a specific number of revolutions in one minute, then we need to find by how many radians the central angle grows in that minute. As shown above, we simply multiply the number of revolutions by 2*Pi.
The second part of this exercise involves a unit conversion. You need to convert radians per minute to radians per second. This conversion works the same way as converting linear speed.
Do you know how to convert something like 100 feet/min to the corresponding velocity in feet/sec ?
I really have no idea where you're at. Are you able to ask any specific questions ?