How long did John sleep if he went to bed at 9:40 P.M., and got up at 7:20 A.M.?
11:60 - 9:40 = 2:20
2:20 + 7:20 = ?
9 hours and 40 minutes
9 hours and 40 mins.
9 hrs and 40 min
To calculate the duration of John's sleep, you need to find the difference between his bedtime and wake-up time. Here's how you can do it step by step:
1. Determine the bedtime: John went to bed at 9:40 P.M.
2. Convert the bedtime to a 24-hour format: 9:40 P.M. is equivalent to 21:40 in a 24-hour format.
3. Determine the wake-up time: John got up at 7:20 A.M.
4. Convert the wake-up time to a 24-hour format: 7:20 A.M. remains unchanged since it's already in a 24-hour format.
5. Calculate the time difference: Subtract the bedtime from the wake-up time.
- 7:20 A.M. - 21:40 = 7:20 - 21:40 = -14:20
Note: The negative sign indicates that the wake-up time is on the following day.
6. Add 24 hours to the time difference to get the positive duration: -14:20 + 24:00 = 9 hours 40 minutes.
Note: Adding 24 hours accounts for the fact that the wake-up time is on the next day.
Therefore, John slept for 9 hours and 40 minutes.