The actual time is 04:00. Here's how I calculated it: 1. The clock shows 3:45, but it's 15 minutes slow. So, the real time is 3:45 + 0:15 = 4:00. 2. However, you mentioned that the actual time is a quarter past an hour. Since 4:00 is already a quarter past an hour (4:15 is a quarter past 4), no further adjustment is needed.