What time is 36 hours before 10.40?

To find the time 36 hours before 10:40, you first subtract 24 hours to get to the same time the previous day, which brings you to 10:40 the day before. Then, subtracting another 12 hours results in 10:40 AM the previous day minus 12 hours, giving you 10:40 PM the day before. Thus, 36 hours before 10:40 is 10:40 PM the previous day.