4 weeks 3 days 13 hours 21 minutes
- 2 weeks 6 days 19 hours 31 minutes
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This is a subtraction
change 1 week in the 4 weeks to 7 days
3weeks 10 days 13 hrs 21 min
then change one day to 24 hrs
3 weeks 9 days 37 hrs 21 min
then change one hour to 60 min
3 weeks 9 days 36 hrs 81 min
now subtract .
first "borrow" a week
3 weeks, 10 days, 13 hours, 21 minutes
now borrow a day
3 weeks, 9 days, 37 hours, 21 minutes
now borrow 1 hour
3 weeks, 9days, 36 hours, 81 minutes
now we can subtract ...
2weeks, 6days,19 hours, 31 minutes
= 1 week, 3 days, 17 hours, 50 minutes
This is a very good question!
To subtract the given durations, you can start by subtracting the minutes, then the hours, then the days, and finally the weeks.
Starting with the minutes:
21 minutes - 31 minutes = -10 minutes
Since you have a negative value for the minutes, you can borrow from the hours:
13 hours - 1 hour = 12 hours
Moving on to the days, you can also borrow from the weeks:
3 days - 6 days (borrowed from weeks) = -3 days
Again, you have a negative value for the days, so you can borrow from the weeks:
4 weeks - 1 week (borrowed) = 3 weeks
Putting it all together, the final result is:
3 weeks, -3 days, 12 hours, -10 minutes
Note: The negative values indicate that the first duration is smaller than the second duration.