You multiplied your speed and his speed by 10. So the circle is now 170 km for your 17knots intercept speed. This won't work because you are too close. You have to extend the line between you and the target to beyond your position behind you to make it work at these proportions. The circle will intersect the line on the extension behind you. But instead it is easier and more foolproof to make your drawing on a 1 km to 1 knot basis.
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