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There are 3 people who work fulltime and are to work together on a project, but their total time on the project is to be equivalent
to that of only one person working full-time. If one of the people is budgeted for 1/2 of his time to the project and
second person for 1/3 of her time, what part of the third worker's time should be budgeted to this project?
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It is the same as to ask:
How much is ?
And the answer is
= = .
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In your post you use the words "his" and "her" as if they relate to the same person.
I did not understand this moment.