If the blueprint uses a scale of 1:12, it means that 1 unit on the drawing represents 12 units in reality.
Given that the actual length of the object is 1.3 m, we can find the length on the drawing by dividing the actual length by the scale factor:
Length on drawing = Actual length / Scale factor
Length on drawing = 1.3 m / 12
Length on drawing = 0.1083 m
Therefore, the length of the line on the drawing is approximately 0.1083 meters.