Question 1177571
<pre>

{{{matrix(1,2,819,miles)/matrix(1,2,13,hours)}}}{{{""=""}}}{{{matrix(1,2,567,miles)/matrix(1,2,"X",hours)}}}

Cross multiply:

{{{819X}}}{{{""=""}}}{{{13*567}}}

Multiply the numbers on the right:

{{{819X}}}{{{""=""}}}{{{7371}}}

Divide both sides by 819

{{{819X/819}}}{{{""=""}}}{{{7371/819}}}

Cancel the 819's on the left.
Divide the numbers on the right.

{{{X}}}{{{""=""}}}{{{9}}}

9 hours     <--answer

Edwin</pre>