One nautical mile is $6080\,ft$. The same in kilometers?
A. $0.9\,km$
B. $0.8\,km$
C. $1.85\,km$
D. None of these

Hint:A nautical mile is a unit of measurement used for the description of territorial waters and for air, marine, and space navigation. A knot is a measuring unit for speed. It is said that if we travel at a speed of one nautical mile per hour, we travel at a speed of one knot.

Complete step by step answer:
A nautical mile is centred on the planet Earth's diameter. We could pick up one of the halves and look at the equator like a circle if we were to break the Earth in half at the equator. We would be able to divide the circle by $360$ degrees. Then we should break a degree into $60$ minutes. A minute of an arc is $1$ nautical mile on planet Earth. All nations use this unit of measurement for air and sea transport.

In relation to measuring distance and velocity on land, sailors use both a nautical mile and a knot for sail measurements. And the substitution of ordinary measurements with nautical miles and knots at sea, in particular allows the Mariners to interpret latitude and longitude charts easily. Given,One nautical mile $ = 6080\,ft$
We know that $1\,km = 3280\,ft$,
$\Rightarrow$ One nautical mile $ = \dfrac{{6080}}{{3280}}$
$\therefore$ One nautical mile $= 1.85\,km$

Hence, option C is correct.

Note:Here we have to remember how much feet is one kilometre. If we put the wrong value our answer would be wrong. An ocean mile is sometimes referred to as a nautical mile. The key distinction between a mile on land and a nautical mile is that the nautical mile is centred on latitude degrees across the globe, whereas it is a calculation of paces on land. The nautical mile on land is generally longer than a mile.