Park your car, check out the sign at the posted coordinates, and take note of how many feet it is "East to Long Path". Use that 3 digit number for calculations.
Solve for N 40 55.xxx W 73 55.xxx
To obtain North Coordinates: Divide that number in half and add your result to the posted north coordinates. Add another 10 for the final
To obtain West Coordinates: Add that number from the sign to the posted West coordinates and add another 17 for the final coordinates.