To calculate the time Anna spent reading, we need to find the difference between the start and end times.
Anna started reading at 10:45am and finished at 1:15pm.
First, we'll consider the time from 10:45am to 12:00pm (noon): This is 15 minutes to reach 11:00am, and then 60 minutes (1 hour) from 11:00am to 12:00pm, making a total of 75 minutes, or 1 hour and 15 minutes.
Next, we'll consider the time from 12:00pm to 1:15pm: This is 1 hour and 15 minutes.
Now, we'll add these two time intervals: 1 hour 15 minutes (from 10:45am to 12:00pm) + 1 hour 15 minutes (from 12:00pm to 1:15pm) = 2 hours 30 minutes
So, Anna spent 2 hours and 30 minutes reading.