Miguel measured the town library and made a scale drawing. The scale he used was 1 millimeter : 7 meters. The parking lot is 7 millimeters long in the drawing. How long is the actual parking lot?
If 1 millimeter represents 7 meters, then 7 millimeters represents 7*7=<<1*7*7=49>>49 meters
The actual parking lot is 49 meters long. Answer: \boxed{49}.