The amount of time from 9:45 to 11:00 is 1 hour and 15 minutes.
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Assuming that's from 10:45 to 8pm: 60 mins = 1 hour 10:45 to 11:00 is 15 mins = 15/60 hours = 1/4 hours 11:00 to 8pm is 11:00 to 20:00 which is 9 hours → total time is 9 1/4 hours.
16:45 - 7:00 = 9:45.
1:45 plus 15 minutes gives us 2:00 pm. It is nine hours from 2:00 to 11:00 pm. Then we have 23 more minutes we can add to the first 15 for 38 minutes. 9 hours and 38 minutes is the elapsed time.
eleven 9:00 + 15:00 = 24:00 = 0:00 2:00 - 0:00 = 2:00 9 + 2 = 11
-11