Math
posted by Quan .
Problem Solving: Work Backward
Will arrived at his mother's office at 3 p.m. It took him 30 minutes to walk from his home to the mall. He was in the mall for 45 minutes. It them took him 15 minutes to walk to his mother's office. At what time did Will leave home?

30 + 45 + 15 = 1 1/2 hours
He left home at 1:30