Total float vs free float Oliver Lehman question 18
Just took Oliver Lehmans 75 free preparation questions. I have a problem understanding the answer to q. 18 Use link for the total question including the necessary network diagram or look in my attachment.
http://www.oliverlehmann.com/pmp-self-test/75-free-questions.htm18. Start dates in the following network logic diagram are defined as early morning, finish dates are evening.
If tasks are scheduled to begin at early start date, what is true?
Activity B has a free float of 10 d.
Activity B has a total float of 10 d.
Activity A has a free float of 10 d.
Activity A has a total float of 10 d.
This is how I calculated:I get total float for activity B to be equal to 10 days (LS=26, ES=16, Total float 26-16=10 days) and free float for activity be also to be equal to 10 days (ES of next activity=31, EF of activity B=21, Free float 31-21= 10 days.
Correct answer is B (total float=10 days) But how do I know that it is not A?