Two cars, initially at rest and $5$km apart at t$=0,$ simultaneously move toward each other. Car A travels at a constant speed of $55$ k$($m$)/$hour, while car B travels at a constant speed of $12$k$($m$)/$ hour.

How long will it take from t$=0$ for car A to meet car B in the middle? 

$\mathrm{A.\; 2}68$s 

$\mathrm{B.\; 2}45$s 

$\mathrm{C.\; 4}90$s 

$\mathrm{D.\; 2}4\mathrm{.}5$s