17. Xiao Ming left home at 7:00 AM and walked to school at a speed of 40 meters per minute. His mother found that Xiao Ming had forgotten to take a homework assignment, so she left home on a bike at 7:20 AM to catch up with Xiao Ming. She caught up with Xiao Ming 1600 meters from home and gave him the homework. After staying there for 5 minutes, the mother turned around and rode back home. So, the time when the mother arrived home was $\qquad$ o'clock and $\qquad$ minutes.
【Analysis】Since Mom caught up with Xiaoming 1600 meters away from home, at that time Xiaoming had walked for 40 minutes, so it was 7:40. Mom walked for 20 minutes, stayed for 5 minutes, and took another 20 minutes to walk back home, so she arrived home at 8:05.