How much is 13:10-10:30

From 13:10 to 10:30, we start with minutes. If we can't reduce 30 minutes from 10 minutes, we borrow from time. After borrowing, we get 70 points. 70 minus 30 equals 40. Because we borrow one, there are 12 minutes left, 12 minus 10 and 2, so the answer is 2:40

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