Question 1194491
12 minutes same as {{{12/60=1/5}}} {{{hour}}};
Distance to be closed is  {{{45(1/5)=9}}} {{{kilometers}}}.


Approach rate is {{{54-45}}} or 9 kilometers per hour.


x, how much time to catch up or close the distance
{{{9x=9}}}

{{{highlight(x=1)}}}