To calculate 0 days, 11 hours, and 15 minutes in the past, you first need to understand how to convert hours and days into each other. Start by considering that 1 day is equal to 24 hours. This means that 11 hours is (11/24) days. After converting the hours to days, add it to the 0 days, which gives you the total time in days.

Next, you need to convert 15 minutes into hours. There are 60 minutes in an hour, so 15 minutes is (15/60) hours, which simplifies to 0.25 hours. Add this to the 11 hours you already have to get the total time in hours.

Thus, 0 days, 11 hours, and 15 minutes in the past would be represented as 0 + (11/24) days, and 11 + 0.25 hours, which is approximately 0.46 days and 11.25 hours in total. This calculation provides a precise way to determine a specific time duration in the past with unit conversion involving days and hours.