Elapsed time and the 24-hour clock

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Learn it Count on in steps: to the next hour, then whole hours, then the extra minutes. On a 24-hour clock, afternoon hours add 12: 3:45 p.m. = 15:45.

Example: From 9:40 a.m. to 1:15 p.m.

9:40 → 10:00 is 20 min.
10:00 → 1:00 is 3 h. 1:00 → 1:15 is 15 min.
Total 3 h 35 min.

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