46. CRIMINAL JUSTICE The body of Alisha was discovered in the basement of the company where she worked. The medical examiner determined that she was killed between 9 P.M. and 10 P.M. After a preliminary investigation, homicide detectives decided to question three of her coworkers: Alex, Bob, and Charlie. The detectives were told by the suspects that Alex left work at 9:18 P.M. on the day of the homicide, walked 1000 ft to his car, and drove 16 mi to his house, arriving home at 9:40 P.M. Bob left work at 9:12 P.M., walked 400 ft to his car, and drove 12 mi to his house, arriving home at 9:30 P.M. Charlie punched out at 9:35:30 P.M., walked 600 ft to his car, and drove 20 mi to his house, arriving home at 10 P.M. After analyzing this information, the detectives singled out Bob for further questioning. Explain why.