You are reviewing the patient's chart to determine when the patient was last medicated. The chart indicates that the patient received medication at 2230 hours. Assuming it is now 10 AM, how long ago did the patient receive the medication?
1. 12 hours
2. 11 hours
3. 12 1/2 hours
4. 11 1/2 hours
The solution will be posted in a few days.