4. The pupils of Mr. Santos arrived at the school ground for volleyball practice at 8:25 a.m. If the practice started at 9:15 a.m., how many minutes were they ahead of the schedule?
5. The Colin family members have their daily exercise every morning. Today, they started jogging around the plaza at 4:30 a.m. They stopped at 6:05 a.m. How long did they spend in today's exercise?
