Question 1013191
Assumption:  The resting period is included in the whole trip time, maybe the wrong assumption.


<pre>
           speed     time           distance
part1       41        1/2            20.5
Gasoline              1/6
part2       27        2/3             18
part3       60        1/2             30
total                {{{1&5/6}}}            {{{68&1/2}}}
</pre>


Speed AVERAGE is  {{{Distance/Time}}};


{{{(68&1/2)/(1&5/6)}}}, miles per hour;
{{{(137/2)(6/11)}}}
{{{137*3/11}}}
{{{highlight(37&4/11)}}} miles per hour



The average speed will be a little higher if the time spent buying gasoline is excluded.