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15 minutes after 10:30 is 10:45. This is because you add 15 minutes to the original time of 10:30. To calculate this, you can add 10 minutes to get to 10:40, and then add another 5 minutes to reach 10:45.
15= .25 so 60= 1.00 and 10/60= .166666667
(10/15) x (60 minutes per hour) = 40 minutes
212 minutes
21.15