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It is a conceptual question. I also do similar ones with numbers they
can't do in their head, and then it becomes more of a "math" problem.
Like... You must average 40 mph on a trip. When you've gone half the
distance, you've averaged only 30 mph. What must be your average for the
remainder of the trip? Answer is not 50 mph...
These tend to be the most difficult motion problems for my students, even
my "brightest" ones.
(Of course, we all know that the three most important
equations in electricity/electronics are I=V/R, V=RI, and R=V/I ;-)