About a year and a half or so ago so I must admit I can't remember the exact numbers but with this type of question the answer must have been the same, and the figures look vaguely familiar.
I remember this question standing out though because as I say, in the post exam post mortem, we all chatted about this one as we hadn't remembered anything in the notes about it to a man, and yet we all came to the same conclusion with the above thought process.
Basically, it's just about the earth being fatter than taller, by a factor of 1 in 297. So if they give you the equatorial value, then the polar value must be smaller by a factor of 1 in 297, nothing more complicated than that (I think !).
If anyone else can confirm this ?