The question does not say decrease from what.
45 x 8 = 360 minutes = 6 hours
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.
7:45
7 hours 45 minutes.
7:45
45 minutes before 9am would be 8:15am. To calculate this, you subtract 45 minutes from 9am, which gives you 8:15am. This is because there are 60 minutes in an hour, so subtracting 45 minutes from 9am leaves you with 15 minutes before the hour.
8 hours 23 minutes - 2 hour 45 minutes = 5 hours 38 minutes.
7:45
45
45 minutes is 3/4 of an hour....and would be 3/32 of 8 hours
It would be 8:30.
45 minutes is 3/8 of two hours.