04:15 Here's the reasoning: 1. The clock shows 3:45. 2. It's 15 minutes slow, so we need to add 15 minutes to the current time (3:45 + 15 minutes = 4:00). 3. The actual time is a quarter past an hour, which means it's 15 minutes past the hour. Since we already calculated the correct time as 4:00, adding another 15 minutes results in 4:15.