Originally Posted by bultaco
I entered the values into the fields of the following online flight computer, and it displays an answer of 111 so I guess it's closer to the correct answer than I got. But my point is that the difference of 1kt on the analogue flight computer is probably of the same order as the thickness of the scale lines.
Sure, one knot difference is almost a given when you use a crp of some sort. i got 110, and it is 111, there is your one knot. but if you look at the answers, 1 knot, or even 2 knots should still bring you to answer A. So, just take whichever one is closest.