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The distance between St. Louis and Kansas is 250 mi.
When he has travelled 144 miles, he is at 250-144=106 miles from Kansas.
The answer is 106 miles.
An equation for this model can be:
Let L be the distance left to arrive to Kansa and D the distance already travelled, we have:
[tex]\begin{gathered} L+D=250 \\ L=250-D \end{gathered}[/tex]When D=144, L is:
[tex]L=250-144=106[/tex]