It rained from 9:19a.m. to 11:31a.m.
How long was it raining?
The duration of rainfall is calculated by subtracting the starting time from the ending time:
11:31 am - 9:19 am
To do this, convert both times into minutes:
11:31 am = 11*60 + 31 = 691 minutes
9:19 am = 9*60 + 19 = 559 minutes
Subtract the starting time from the ending time to determine the duration of rain:
691 minutes - 559 minutes = 132 minutes
Therefore, it was raining for 132 minutes.