angular momentum

Two gerbils run in place with a linear speed of 0.45m/s on an exercise wheel that is shaped like a hoop. Find the angular momentum of the system if each gerbil has a mass of 0.22 kg and the exercise wheel has a radius of 6.5cm and a mass of 4.0g . Express your answer using two significant figures. L = ________ kg⋅m^2/s