Final answer:
Cindy went into labor at 11:00 PM, was in labor for 4 hours, and then drove for 1 1/2 hours to the hospital. Therefore, she arrived at the hospital at 4:30 AM.
Step-by-step explanation:
The student's question asks about calculating the time of arrival at the hospital after a given duration of labor and travel time. Cindy went into labor at 2300 hours (11:00 PM) and was in labor for four hours, so she left the house at 0300 hours (3:00 AM). Adding the 1 1/2 hours of drive time to the hospital, we need to calculate the new time.
Step 1: Convert 1 1/2 hours to minutes: 1 hour and 30 minutes.
Step 2: Convert 0300 hours to a more simple format: 3:00 AM.
Step 3: Add the travel time to the departure time:
- 3:00 AM + 1 hour = 4:00 AM
- 4:00 AM + 30 minutes = 4:30 AM
So, Cindy arrived at the hospital at 4:30 AM.