Step One: (Jamal started writing thank-you notes at 5:25. It took him 20 minutes to write them.) So Jamal wrote thank you notes until 5:45
Step Two: He also spent some time writing addresses 6:00.
Answer: If you are asking how long it took after 5:45, the answer will be 15 Minutes because 5:45 + 0:15 = 5:60 and since 60 minutes is 1 hour, you have 6:00
