Solve.Parts for an automobile repair cost $180. The mechanic charges $30 per hour. If you receive an estimate for at least $360 and at most $450 for fixing the car, what is the time interval that the mechanic will be working on the job?
A. Between 1 hr and 9 hr
B. Between 12 hr and 15 hr
C. Between 6 hr and 9 hr
D. Between 1 hr and 6 hr
Answer: C
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A. Yes B. No
Solve the problem using Snell's Law: 
= 
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A. -2
B. 
C. - 
D. - 