Elapsed time 50 minutes. ending time 9:05 am find starting time

8:15 am

Step-by-step explanation:

Count back from 9:05 50 minutes. I did it in parts.

First, I went back 5 minutes:

9:05 am 50 minutes elapsed

9:00 am 45 minutes elapsed

Then I went back the rest of the 45 minutes

9:00 am 45 minutes elapsed

8:15 am 0 minutes elapsed

9:05-:05 = 9:00-:45=8:15