Question

3h 40min
10 h 15 min Renaming 11:00 as 10 hours 15 minutes
-7h 35 min Subtract the beginning time
------------------
3h 40 min Subtract

So I actually subtract all of it and not add the minutes right?

So my answer should be 3h 20min right?

How can I check if this is right?
Anyone?

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