Q. The unit to measure the speed of ships is
Solution:
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A knot is one nautical mile per hour (1 knot = 1.15 miles per hour ).
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The term knot dates from the 17th century, when sailors measured the speed of their ship by using a device called a “common log.”
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This device was a coil of rope with uniformly spaced knots, attached to a piece of wood shaped like a slice of pie.
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