its 1h15 min
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1 hour and 30 minutes
8:30 plus 45 minutes equals 9:15. To add the two times together, you can convert 8:30 to 8:00 and add the 45 minutes to get 8:45. Then, adding another 30 minutes gives you a total of 9:15.
6:15
11:15
3 hours, 35 minutes, and 45 seconds plus 1 hour, 45 minutes and 30 seconds is 5 hours, 21 minutes, and 15 seconds.