Question 995687
Unit Conversion.


{{{504*miles*(1/19)(gallons/mile)*(65/1)(miles/hour)=Q*(gallons*miles/hour)}}}


<s>What is the fuel efficiency?  The question NEEDS a value for fuel efficiency.</s>


Another try:
{{{504*miles*(1/65)(hour/miles)=(504/65)*hours}}}
What could you possibly do with the fuel efficiency  19 miles/gallon?  You seem to not need to use the fuel efficiency for this question exercise.
About {{{7&3/4}}} hours.