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**Hint:**Length is a unit of measurement for distance. Length is a number with the dimension distance in the International System of Quantities. In most measuring schemes, a base unit for length is selected from which all other units are obtained. The metre is the base unit of length in the International System of Units (SI).

**Complete step by step answer:**

Hand span is the time between the tips of the thumb and the tips of the little fingers when the hand is completely extended. The student can make a mark on the tips of the thumb and little finger.An adult male's hand measures 7.6 inches long and measures from the tip of the longest finger to the crease under the thumb. An adult female's hand is 6.8 inches long on average.

However, hand size is more than just length. Since hand span and cubit sizes differ from person to person, they are not used as uniform units of measurement. As a result, two people can give separate measurements for the same duration, which is undesirable for a standard unit.

A stretch is the length of a human hand measured from the tip of the thumb to the tip of the little finger. A period was known to be half a cubit in ancient times.It is assumed that one pace-span is four times the length of one foot-span. As a result, one pace-span equals four foot-spans.It is therefore assumed that the length of the rod is six pace-spans.

As a result, 6 pace-spans = (4$\times$ 6) = 24 foot-spans.

**Hence, the rod's length in terms of foot-span is 24.**

**Note:**The cubit was based on the length of the arm from the elbow to the tip of the middle finger and was considered the size of 6 palms or 2 spans. It was as long as 21 inches in some ancient civilizations (531 mm).

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