It would appear that the question is about the number of linear inches in a volume. If so, the question has no meaning. 11*12*29 is a volume with dimensions [L3] whereas linear inches are a measure of distance with dimension [L]. Basic dimensional analysis teaches that you cannot convert one to the other.
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39.25 inches
63. The inch is a linear measurement, so the adjective is unnecessary.
12 INCHES
80 inches is 6.66 feet.
12 inches is equivalent to 1 foot.