With this information, you can calculate the quantity of leagues 18 miles is equal to.

¿What is the inverse calculation between 1 league and 18 miles?

Performing the inverse calculation of the relationship between units, we obtain that 1 league is 0.16666667 times 18 miles.

Which is the same to say that 18 miles is 6 leagues.

Eighteen miles equals to six leagues. *Approximation

A league is zero times eighteen miles. *Approximation