Mr. Griffith's car battery died, resulting in his car not being able to start. Mr. Griffith's roommates were all sleeping soundly and he did not have the heart to wake them up, so he decided to walk to school. If Mr. Griffith lives 1.5 miles from the school and can walk at an average speed of 0.5 miles/minute, how long will it take Mr. Griffith to get to school from his house?
