What is the format of adding and subtracting moments in physics or mathematics? How many hours are there between 8: 30 and 10: 45?
In fact, this can imitate decimal addition and subtraction, such as 10:45 MINUS 9:50. If the minute is very small, take one from the hour position, which is 60 minutes. If it becomes 9: (45+60) minus 9:50=55 minutes, when actually writing the formula, minutes correspond to minutes and clocks correspond to minutes. Other analogies