Given that the clock is slow by 15 minutes and it's currently showing 3:45, we need to add 15 minutes to the displayed time to find the actual time. The statement indicates that the actual time is a quarter past an hour, meaning that it is a multiple of a quarter hour (15 minutes) and 15 minutes after some hour, in this case, 3:45 + 15 minutes. 3:45 + 15 minutes = 4:00 The correct time based on the information provided is 4:00.