12:59:59 - 11:04:21
Understand the Problem
The question is asking to subtract two times given in the format hours:minutes:seconds. We must perform subtraction considering that 60 seconds make a minute and 60 minutes make an hour.
Answer
1:55:38
Answer for screen readers
1:55:38
Steps to Solve
- Subtract the seconds
Subtract the seconds: $59 - 21 = 38$ seconds.
- Subtract the minutes
Subtract the minutes: $59 - 04 = 55$ minutes.
- Subtract the hours
Subtract the hours: $12 - 11 = 1$ hour.
- Combine the results
Combine the results to get the final time: 1 hour, 55 minutes, and 38 seconds.
1:55:38
More Information
The subtraction of time is analogous to regular subtraction, with the key difference being that you're working in base 60 for both minutes and seconds.
Tips
A common mistake is forgetting that minutes and seconds are base-60 units, not base-10. If the seconds or minutes subtraction results in a negative number, you need to borrow from the next higher unit (minutes or hours, respectively).
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