The two answers above remind me of the old bull and young bull joke. They're standing at the top of the hill looking down at the herd of cows. Young one says hey look at all those cows! Let's run down the hill and
one of them. Old bull says, why don't we walk down and
them all.
GF takes the wise, simple approach and could definitely get the answer in his head if desired.
Whoever posed this question was definitely looking for you to figure out it was essentially a northerly course from A to B and have you get the difference on the latitude minutes which equates to NM.