Was the question really with that wordingWith that limited information for 3 phase?
There should be some assumptions if it is.
PF is 1.
Delta or Wye does matter. The branch of a delta or the phase section of a delta current.
The other assumption is , it is a balanced system?
Links from a internet search.
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So the real question is. Do you have the concepts of the phase angle of a circle?
degrees versus radians?
This will help. Concepts first, then try the calculations.
There is the some math resources. I do not know your level so do not take to heart any insult with the posts.
The real Question you should be asking yourself. How much points is it worth to my over all test?
I would move on and answer all the ones I know.
Concentrate on concepts, the math will come later.
If you have more wording on the question it would help.