Ratio, SM-Bank 045 Determine the scale factor if a length of 5 millimetres on a map represents an actual distance of 20 metres. (2 marks) --- 4 WORK AREA LINES (style=lined) --- Show Answers Only \(4000\) Show Worked Solution \(\text{Scale ratio}\) \(=5\ \text{mm}\ :\ 20\ \text{m}\) \(=5\ \text{mm}\ :\ 20\ 000\ \text{mm}\) \(=1\ :\ 4000\) \(\text{Scale factor}\) \(=4000\)