A movie started at 10.35 p.m. and ended at 1.15 a.m. How long did the movie last?

1. Calculate the time from 10.35 p.m. to midnight

From 10.35 p.m. to 11.00 p.m. is $25$ minutes.
From 11.00 p.m. to 12.00 midnight is $1$ hour.
Total time to midnight = $1$ h $25$ min.

2. Calculate the time from midnight to the end time

From 12.00 midnight to 1.15 a.m. is $1$ h $15$ min.

3. Add the two durations together to find the total time

Total duration = $1$ h $25$ min + $1$ h $15$ min
$= 2$ h $40$ min.