A bit longer than a metre.
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None, as a hole which is 6 inches wide and 42 inches long has no depth and thus no volume.
42 inches is 3 feet 6 inches
It is also 42 inches. 42 inches is a measure of length. It does not matter about the 'attitude' of that length, be it horizontal, vertical, angled etc., It is still 42 inches. However, 42 inches in feet and inches is 3 ft 6 inches, or 1 yard, 0 ft. 6 inches.
42 centimeters = about 16.5 inches (16.5354331 inches)
42 inches is 3 feet and 6 inches