25 minutes
10 minutes get to 10, and then another 15 minutes gets to quarter past making 10 + 15 = 25 minutes in total.
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10 before to 15 after = 25 minutes
quarter past ten means 15 minutes after 10o'clock
In telling the time 10 past 8 is 10 minutes after 8:00 o'clock.
10 minutes after 11
9:45 or a quarter to ten.