Question 1171220
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<pre>

The time equation is


    {{{270/x}}} - {{{270/(x+6)}}} = {{{1/2}}}.


Each term in the left side is the traveled time.


{{{1/2}}}  in the right side represents half an hour time difference.


Reduce to quadratic equation and solve it using quadratic formula or factoring.



<U>ANSWER</U>.  54 km/h  and  60 km/h.
</pre>


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