Answer :
[tex]450\ miles\ in\ 10\ hours\\\\
540\ miles\ in\ x\ hour\\\\making\ proportion:\\
450-10\\540-x\\\\cross\ multiplication\\\\
450=540*10\\\\
450x=5400\ \ \ \ \ | divide\ by\ 450\\\\
x=12\\\\
It\ will\ take\ 12\ hours.[/tex]
450/10=540/x and than do cross multiply, 450x=5400 divide both side by 450 = 12 hours