To find the unit rate of active minutes per class, divide the total active minutes (72) by the number of times Justin attended the fitness class (3).
The unit rate of active minutes per class is therefore 72/3 = <<72/3=24>>24 minutes per class. Answer: \boxed{24}.
Justin starts going to a new fitness class his smart watch tracks a total of 72 active minutes in the week if he attended the class 3 times what is the unit rate of active minutes per classs
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