Answer :

Rob finished his homework at 6:00 PM.

If Rob started working on his homework at 4:30 PM and spent 1 and a half hours on it, we can calculate the finishing time by adding the duration to the starting time.

Starting time: 4:30 PM

Duration: 1 and a half hours

To add the duration, we add 1 hour and 30 minutes to the starting time:

4:30 PM + 1 hour = 5:30 PM

5:30 PM + 30 minutes = 6:00 PM

Therefore, Rob finished his homework at 6:00 PM.

However, if we consider the time format with 24-hour notation, the finishing time would be 18:00 (6:00 PM).

Learn more about time duration here:

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