Question 1044859
Expressions for distance and times only are given.
RT=D is Travel Rates Rule for constant rate.
I assume you wrote your "second traveled for..." incorrectly.


<pre>
               SPEED         TIME           DISTANCE
vehicle1                     {{{x^2-16}}}        x+4
vehicle2                     {{{2/(x-4)}}}        x+4

</pre>
Same distance but different travel times - The speed of the vehicles are not the same.  Do you want AVERAGE SPEED?  Question does not tell.


All you can do is this:
<pre>
               SPEED              TIME           DISTANCE

vehicle1     (x+4)/(x^2-16)      x^2-16          x+4

vehicle2    (x+4)/(2/(x-4))     2/(x-4)          x+4

</pre>

Simplifiable to
<pre>
               SPEED              TIME           DISTANCE

vehicle1     {{{highlight(1/(x-4))}}}              x^2-16          x+4

vehicle2    {{{highlight((x^2-16)/2)}}}           2/(x-4)          x+4

</pre>