Keep in mind that the majority of training questions are simplistic and involve assumptions .. whether stated or implied ... so that they can be simplistic.
The inferences with this question is that there exists neither turbulence nor gradient associated with the wind field .. either of which will change the outcome.
However, the main thrust of the question is to get the student to understand, as a starting point, that wind is relevant to navigation (ie G/S) rather than aircraft speed as the pilot sees it in the cockpit (IAS).