640/240 = 2.666 or 2 and 2/3 inches.
480/240 = 2 inches
So the image is 2.6666x2 inches, or about 5.33 (5 and 1/3) inches squared.
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1.5 inch=300 pixel
It is the same. 1 dot is also 1 pixel.
Resulation means pixel per inch either row side or column side, so row side= 512/2=256 or column side 512/2=256.
For a 12 x 12 inch print your ideal image resolution dimensions should be 3600 pixels by 3600 pixels. At a minimum your dimensions should be 1800 by 1800 pixels. Larger mega pixel producing cameras are often better when you want to crop your image down to smaller sizes.
Linear inch is a fantasy word from the airliners. It means: X linear inches = length + width + depth (measured in inches). Inches are still inches.