If Bob earns $120 in 20 hours, what is his unit rate?
To find the unit rate, we divide the total amount earned ($120) by the number of hours worked (20).
The unit rate is $120 รท 20 = $<<120/20=6>>6 per hour. Answer: \boxed{6}.
To find the unit rate, divide the total earned amount by the total number of hours worked.
Bob earned $120 in 20 hours, so his unit rate is calculated as:
Unit Rate = Total Amount Earned / Total Hours worked
Unit Rate = $120 / 20 hours
The unit rate is $6 per hour.