Let the distance traveled by the Nautilus in miles be represented by the variable d.
We know that 1 mile equals x leagues. Therefore, the distance traveled in leagues can be expressed as 20,000 leagues.
To find the distance traveled in miles, we can set up the following equation:
d miles = (20,000 leagues) / x leagues per mile
Simplifying this expression by substituting x = 1 mile/ x leagues, we get:
d miles = (20,000 leagues) * (1 mile / x leagues)
Thus, the algebraic expression for this word problem is:
d = 20,000 / x
where d represents the distance traveled in miles and x represents the number of leagues in one mile.