<PRE><B>Question 1210622</B>
&lt;pre&gt;
SPEED          TIME(minutes)         DISTANCE
 60            40                    40
 40            30                    20
 56            10.7                  10
TOTAL          80.7 minutes          70
&lt;/pre&gt;
That on its own gives a speed done as about {{{70/((80.7/60))=52}}} miles per hour.

The question asked seems too open ended.  Is the exercise expect to pick from the speeds already used
 or the distances already used, and find the resulting speed?  Is the person expected to choose a 
result average speed and find combinations of some other miles and speeds to make the expected average
speed fit?</PRE>