Don't know if this is what you're looking for but here. Hope it helps.
Sara woke up at 9:00. She has dance practice at noon(12:00) it ends at 2:15. She has to meet her friend Jerry for pizza at 5:30. How much time does she have before dance, at dance, and from dance to dinner?
Kind of hard to follow but first take 9:00 to 12:00. 12-9=3 so 3 hours before dance. Next how long dance is. To get from 12:00 to 2:00 you need 2 hours. to get from 2:00 to 2:15 is 15 minutes. So dance is 2 hours and 15 minutes. After dance until dinner is going to be 2:15 to 5:30. To get to 2:00 to 5:00 is three hours. You need 15 minutes from 15 to 30. So She has 3 hours and 15 minutes from dance to dinner.