Question like that on a license test does not make much sense to me. May have predicted current available one way or another somewhere. However actual current 50 miles down river from Chester Pa may be considerably different than published sources. Big river like the Delaware current speed and tide height will vary depending on fresh water run off from upriver. Shallower water wind will alter predictions.
It’s prudent to consult sources, observation best way to find out what’s actually happening. Why would they put such a question on the test.