Short Answer 
The movie has a duration of 1 hour and 38 minutes and finishes at 1:10 PM. By subtracting the duration from the finish time, the movie started at 11:32 AM.
Step 1: Determine Movie Duration
The movie lasts for a total of 1 hour and 38 minutes. This information is crucial as it tells us how long we need to subtract from the finishing time to find out when it started. Knowing the duration allows us to methodically calculate backwards from the end time.
Step 2: Find Finish Time
The movie concludes at 1:10 PM. From this end time, we will subtract the duration of the movie to find out when it began. Starting this calculation, we will first subtract the full hour and then handle the minutes separately to ascertain the precise start time of the movie.
Step 3: Calculate Start Time
To find the start time, we begin by subtracting the hour and the remaining minutes from 1:10 PM: 1:10 PM minus 1 hour results in 12:10 PM. Next, subtract the 10 minutes and then 28 minutes, reaching 12:00 PM and finally 11:32 AM as the movie start time.