We say that a single step has a length x miles, where x is a real number (and it is less than 1).
Now, if we need to travel 1000 miles, the number of steps can be calculated as:
(# of steps of size x) = (1000 miles) / (x miles)
n = 1000/x
Where n is the number of steps we need to take in order to finish a journey of 1000 miles. To solve this problem, we need to know the step length.
If the journey were 1000 km, we can use the conversion from miles to kilometers:
1 mi = 1.609 km
Then, the step length can be converted to:
x miles = 1.609 x km
And the number of steps would be:
n = (1000 km) / (1.609 x km)
n = 621.50/x