3h 40min
10 h 15 min Renaming 11:00 as 10 hours 15 minutes
-7h 35 min Subtract the beginning time
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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?
To check if your answer is correct, you can use a simple method called "counting up" or "counting back."
1. Start with the beginning time (10 hours 15 minutes in this case).
2. Subtract each duration from the beginning time.
Subtracting the first duration (3 hours 40 minutes) from the beginning time (10 hours 15 minutes), you get:
10 hours 15 minutes
-3 hours 40 minutes
---------------------
6 hours 35 minutes
Subtracting the second duration (7 hours 35 minutes) from the result above (6 hours 35 minutes), you get:
6 hours 35 minutes
-7 hours 35 minutes
---------------------
-1 hour 0 minutes
Now, since you have a negative value for the hours, this means that the ending time is actually 1 hour back from the beginning time. To determine the correct ending time, you need to add the negative value (1 hour 0 minutes) to the beginning time:
10 hours 15 minutes (beginning time)
+(-1 hour 0 minutes)
---------------------
9 hours 15 minutes
Therefore, the correct ending time is 9 hours 15 minutes.
To summarize, the correct calculation is:
Beginning time: 10 hours 15 minutes
- Duration 1: 3 hours 40 minutes
- Duration 2: 7 hours 35 minutes
--------------------------
Ending time: 9 hours 15 minutes
So, your answer of 3 hours 20 minutes is not correct. The correct ending time is 9 hours 15 minutes.